Year	Millions of 2000 Dollars
1998-01-01	59.04970000000000
1999-01-01	70.26510000000000
2000-01-01	74.30540000000000
2001-01-01	71.23410000000000
2002-01-01	55.59500000000000
2003-01-01	76.89520000000000
2004-01-01	100.55000000000000
2005-01-01	125.72900000000000
2006-01-01	156.67100000000000
2007-01-01	203.99599999999998
2008-01-01	283.88800000000000
2009-01-01	359.88599999999997
2010-01-01	449.43800000000005
2011-01-01	596.95500000000000
2012-01-01	586.38600000000000
2013-01-01	640.94900000000010
2014-01-01	649.58600000000000
2015-01-01	655.43200000000000