Year	Millions of 2011 U.S. Dollars
1970-01-01	36835
1971-01-01	38525
1972-01-01	41188
1973-01-01	43513
1974-01-01	44647
1975-01-01	45259
1976-01-01	46741
1977-01-01	49677
1978-01-01	53245
1979-01-01	55484
1980-01-01	57092
1981-01-01	58527
1982-01-01	59401
1983-01-01	58967
1984-01-01	60858
1985-01-01	62042
1986-01-01	62306
1987-01-01	64574
1988-01-01	66509
1989-01-01	70243
1990-01-01	75660
1991-01-01	76902
1992-01-01	79655
1993-01-01	81498
1994-01-01	86302
1995-01-01	94580
1996-01-01	101766
1997-01-01	112876
1998-01-01	121681
1999-01-01	133747
2000-01-01	146182
2001-01-01	153188
2002-01-01	162185
2003-01-01	168931
2004-01-01	176546
2005-01-01	185973
2006-01-01	195851
2007-01-01	206001
2008-01-01	199878
2009-01-01	185898
2010-01-01	185099
2011-01-01	186405