| Date | (US$ Billion) |
|---|---|
| 2009.03 | 300.12 |
| 2009.02 | 294.19 |
| 2009.01 | 292.68 |
| 2008.12 | 291.71 |
| 2008.11 | 280.68 |
| 2008.10 | 278.15 |
| 2008.09 | 281.13 |
| 2008.08 | 282.09 |
| 2008.07 | 290.90 |
| 2008.06 | 291.40 |
| 2008.05 | 290.07 |
| 2008.04 | 289.38 |
| 2008.03 | 286.86 |
| 2008.02 | 277.84 |
| 2008.01 | 272.82 |
| 2007.12 | 270.31 |
| 2007.11 | 270.09 |
| 2007.10 | 265.92 |
| 2007.09 | 262.94 |
| 2007.08 | 261.37 |
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