| Month | Median | YOY | Average | YOY |
| Jul 10 | 185 | 2.78% | 214.9 | 5.55% |
| Jun 10 | 194 | 7.78% | 216.8 | 6.80% |
| May 10 | 190 | 5.56% | 215.3 | 7.22% |
| Apr 10 | 185 | 10.78% | 205.7 | 7.87% |
| Mar 10 | 182 | 8.66% | 204.8 | 8.47% |
| Feb 10 | 180 | 7.78% | 200 | 5.82% |
| Jan 10 | 170 | 0.59% | 197.6 | 3.56% |
| Month | Median | YOY | Average | YOY |
| Dec 09 | 187.5 | 4.17% | 214 | 6.31% |
| Nov 09 | 187 | 1.08% | 211.4 | 3.68% |
| Oct-09 | 185 | -5.13% | 208 | -5.02% |
| Sep 09 | 183 | -6.15% | 207.1 | -3.45% |
| Aug 09 | 190 | -12.84% | 205.9 | -14.95% |
| Jul 09 | 180 | -16.86% | 203.6 | -14.42% |
| Jun 09 | 180 | -18.18% | 203 | -16.60% |
| May 09 | 180 | -21.81% | 200.8 | -21.19% |
| Apr 09 | 167 | -29.48% | 190.7 | -25.30% |
| Mar 09 | 167.5 | -34.26% | 188.8 | -31.32% |
| Feb 09 | 167 | -34.74% | 189 | -32.45% |
| Jan 09 | 169 | -33.73% | 190.8 | -30.97% |
| Month | Median | YOY | Average | YOY |
| Dec-08 | 180 | -35.71% | 201.3 | -35.23% |
| Nov 08 | 185 | -38.21% | 203.9 | -38.29% |
| Oct-08 | 195 | -36.23% | 219 | -34.59% |
| Sep 08 | 195 | -39.06% | 214.5 | -38.92% |
| Aug 08 | 218 | -32.80% | 242.1 | -32.94% |
| Jul 08 | 216.5 | -36.32% | 237.9 | -37.79% |
| Jun 08 | 220 | -35.28% | 243.4 | -36.60% |
| May 08 | 230.2 | -34.23% | 254.8 | -34.11% |
| Apr 08 | 236.8 | -33.30% | 255.3 | -35.14% |
| Mar 08 | 254.8 | -27.20% | 274.9 | -30.12% |
| Feb 08 | 255.9 | -30.37% | 279.8 | -32.17% |
| Jan 08 | 255 | -28.17% | 276.4 | -28.98% |
| Month | Median | YOY | Average | YOY |
| Dec 07 | 280 | -21.13% | 310.8 | -20.92% |
| Nov 07 | 299.4 | -16.13% | 330.4 | -16.54% |
| Oct-07 | 305.8 | -15.06% | 334.8 | -16.45% |
| Sep 07 | 320 | -11.85% | 351.2 | -12.66% |
| Aug-07 | 324.4 | -12.56% | 361 | -12.27% |
| Jul-07 | 340 | -9.26% | 382.4 | -7.99% |
| Jun 07 | 339.9 | -10.55% | 383.9 | -11.07% |
| May 07 | 350 | -7.65% | 386.7 | -8.50% |
| Apr 07 | 355 | -2.74% | 393.6 | -2.69% |
| Mar 07 | 350 | -6.54% | 393.4 | -4.12% |
| Feb 07 | 367.5 | -1.47% | 412.5 | 0.36% |
| Jan 07 | 355 | -3.51% | 389.2 | -4.00% |
| Month | Median | YOY | Average | YOY |
| Dec 06 | 355 | -5.33% | 393 | -5.19% |
| Nov 06 | 357 | -5.80% | 395.9 | -4.30% |
| Oct 06 | 360 | -5.26% | 400.7 | -3.38% |
| Sep 06 | 363 | -5.71% | 402.1 | -4.31% |
| Aug 06 | 371 | -5.53% | 411.5 | -3.31% |
| Jul 06 | 374.7 | -3.68% | 415.6 | -0.05% |
| Jun 06 | 380 | 0.00% | 431.7 | 4.65% |
| May 06 | 379 | 0.80% | 422.6 | 4.14% |
| Apr 06 | 365 | -1.08% | 404.5 | 2.25% |
| Mar 06 | 374.5 | 7.00% | 410.3 | 7.75% |
| Feb 06 | 373 | 6.57% | 411 | 11.20% |
| Jan 06 | 367.9 | 9.66% | 405.4 | 12.21% |
|
|
| Month | Median | YOY | Average | YOY |
| Dec 05 | 375 | 13.64% | 414.5 | 16.50% |
| Nov 05 | 379 | 14.85% | 413.7 | 16.31% |
| Oct 05 | 380 | 16.92% | 414.7 | 19.03% |
| Sep 05 | 385 | 19.20% | 420.2 | 21.87% |
| Aug 05 | 392.7 | 24.98% | 425.6 | 26.52% |
| Jul 05 | 389 | 23.53% | 415.8 | 23.02% |
| Jun 05 | 380 | 22.58% | 412.5 | 22.69% |
| May 05 | 376 | 25.79% | 405.8 | 25.17% |
| Apr 05 | 369 | 27.24% | 395.6 | 26.51% |
| Mar 05 | 350 | 26.58% | 380.8 | 26.09% |
| Feb 05 | 350 | 30.60% | 369.6 | 28.42% |
| Jan 05 | 335.5 | 31.62% | 361.3 | 22.93% |
| Month | Median | YOY | Average | YOY |
| Dec 04 | 330 | 26.92% | 355.8 | 24.10% |
| Nov 04 | 330 | 29.41% | 355.7 | 29.77% |
| Oct 04 | 325 | 30.00% | 348.4 | 29.47% |
| Sep 04 | 323 | 29.25% | 344.8 | 26.67% |
| Aug 04 | 314.2 | 25.73% | 336.4 | 0.78% |
| Jul 04 | 314.9 | 29.32% | 338 | 0.75% |
| Jun 04 | 310 | 25.76% | 336.2 | 2.47% |
| May 04 | 298.9 | 25.59% | 324.2 | -15.15% |
| Apr 04 | 290 | 23.51% | 312.7 | 22.15% |
| Mar 04 | 276.5 | 20.74% | 302 | 9.26% |
| Feb 04 | 268 | 19.80% | 287.8 | 20.07% |
| Jan 04 | 254.9 | 17.20% | 293.9 | 24.75% |
| Month | Median | YOY | Average | YOY |
| Dec 03 | 260 | 18.24% | 286.7 | 19.41% |
| Nov 03 | 255 | 16.44% | 274.1 | 14.88% |
| Oct 03 | 250 | 16.28% | 269.1 | 15.20% |
| Sep 03 | 249.9 | 14.63% | 272.2 | 13.46% |
| Aug 03 | 249.9 | 16.23% | 333.8 | 35.86% |
| Jul 03 | 243.5 | 15.95% | 335.5 | 48.91% |
| Jun 03 | 246.5 | 20.30% | 328.1 | 44.60% |
| May 03 | 238 | 19.60% | 382.1 | 70.96% |
| Apr 03 | 234.8 | 23.58% | 256 | 16.21% |
| Mar 03 | 229 | 23.12% | 276.4 | 35.56% |
| Feb 03 | 223.7 | 24.28% | 239.7 | 17.50% |
| Jan 03 | 217.5 | 21.58% | 235.6 | 20.20% |
| Month | Median | YOY | Average | YOY |
| Dec 02 | 219.9 | 25.66% | 240.1 | 23.32% |
| Nov 02 | 219 | 25.14% | 238.6 | 23.76% |
| Oct 02 | 215 | 25.00% | 233.6 | 20.41% |
| Sep 02 | 218 | 28.24% | 239.9 | 27.61% |
| Aug 02 | 215 | 22.86% | 245.7 | 26.06% |
| Jul 02 | 210 | 20.07% | 225.3 | 16.61% |
| Jun 02 | 204.9 | 16.62% | 226.9 | 16.30% |
| May 02 | 199 | 17.27% | 223.5 | 17.45% |
| Apr 02 | 190 | 13.77% | 220.3 | 19.79% |
| Mar 02 | 186 | 12.80% | 203.9 | 11.36% |
| Feb 02 | 180 | 13.07% | 204 | 13.90% |
| Jan 02 | 178.9 | 18.48% | 196 | 18.50% |
| Month | Median | YOY | Average | YOY |
| Dec 01 | 175 | NA | 194.7 | NA |
| Nov 01 | 175 | NA | 192.8 | NA |
| Oct 01 | 172 | NA | 194 | NA |
| Sep 01 | 170 | NA | 188 | NA |
| Aug 01 | 175 | NA | 194.9 | NA |
| Jul 01 | 174.9 | NA | 193.2 | NA |
| Jun 01 | 175.7 | NA | 195.1 | NA |
| May 01 | 169.7 | NA | 190.3 | NA |
| Apr 01 | 167 | NA | 183.9 | NA |
| Mar 01 | 164.9 | NA | 183.1 | NA |
| Feb 01 | 159.2 | NA | 179.1 | NA |
| Jan 01 | 151 | NA | 165.4 | NA |
|
