Month	Millions of Dollars
2007-01-01	3.982735000000000
2007-02-01	4.114561999999999
2007-03-01	7.331147000000000
2007-04-01	16.024817999999996
2007-05-01	7.875513999999998
2007-06-01	13.607189000000000
2007-07-01	10.093199000000000
2007-08-01	8.020426000000000
2007-09-01	9.997021000000000
2007-10-01	7.748689000000000
2007-11-01	10.797856000000000
2007-12-01	9.989934000000000
2008-01-01	9.099345000000000
2008-02-01	19.674576000000000
2008-03-01	10.616067000000003
2008-04-01	17.461337000000000
2008-05-01	30.471086000000007
2008-06-01	19.860194000000003
2008-07-01	23.772442000000000
2008-08-01	18.911274000000000
2008-09-01	24.037205000000000
2008-10-01	12.489172000000000
2008-11-01	10.986050999999998
2008-12-01	9.978709000000002