| 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | |
| JAN | 5.6 | 11.0 | 9.9 | 5.6 | 7.9 | 7.7 | ||
| FEB | 9.3 | 8.0 | 6.8 | 9.4 | 4.2 | 7.5 | 9.6 | |
| MAR | 9.3 | 9.6 | 10.1 | 12.7 | 7.8 | 8.1 | 12.3 | 5.7 |
| APR | 12.2 | 13.7 | 10.2 | 9.5 | 10.8 | 12.5 | 10.7 | 13.0 |
| MAY | 17.8 | 21.8 | 18.1 | 20.8 | 17.3 | 16.6 | 18.1 | |
| JUN | 20.5 | 20.2 | 20.1 | 15.6 | 20.9 | 21.3 | ||
| JUL | 20.2 | 18.8 | 24.9 | 22.8 | 20.5 | |||
| AUG | 19.8 | 20.8 | 21.6 | 18.7 | 16.7 | 18.8 | 18.8 | |
| SEP | 18.4 | 17.8 | 17.8 | 17.9 | 14.2 | 17.4 | 15.7 | |
| OCT | 13.6 | 12.7 | 16.9 | 13.7 | 15 | 14.6 | 13.9 | |
| NOV | 10.5 | 10.9 | 10.9 | 9.4 | 12.1 | 12.1 |
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| DEC | 7.0 | 5.3 | 9.8 | 10.9 | 6.9 |
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Last Updated on 4/8/2009
By RSMP