Year	Millions of 2000 Dollars
1977-01-01	175126
1978-01-01	182639
1979-01-01	253598
1980-01-01	277341
1981-01-01	264187
1982-01-01	264630
1983-01-01	296309
1984-01-01	267918
1985-01-01	305345
1986-01-01	338319
1987-01-01	406047
1988-01-01	469234
1989-01-01	419363
1990-01-01	460553
1991-01-01	543984
1992-01-01	653291
1993-01-01	924800
1994-01-01	813348
1995-01-01	1000000
1996-01-01	1300000
1997-01-01	1500000
1998-01-01	1700000
1999-01-01	1900000
2000-01-01	2100000
2001-01-01	2300000
2002-01-01	2600000
2003-01-01	3000000
2004-01-01	3400000
2005-01-01	3900000
2006-01-01	4800000
2007-01-01	5800000
2008-01-01	7200000
2009-01-01	9100000
2010-01-01	11000000
2011-01-01	13000000
2012-01-01	15000000
2013-01-01	17000000
2014-01-01	19000000
2015-01-01	20000000
2016-01-01	20000000