YEAR Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual 24-hr Avg.
2005    9337 9119 9630 9083 9511 8569 8539 7844 8171
2006 8100 8667 8776 8400 9437 9585 8617 9826 8545  8500 7465
2007 8262 8407 8978 9497 10139 9358   9536 9274 8599 7990
2008 7322 8105 8421  8756 8822 8239    7520
2009 7454 7731 7571 8416 8689 8926 8481 8738 8339