Year	Millions of 2000 Dollars
1960-01-01	2400000
1961-01-01	2600000
1962-01-01	2800000
1963-01-01	3000000
1964-01-01	3200000
1965-01-01	3400000
1966-01-01	3500000
1967-01-01	3700000
1968-01-01	3900000
1969-01-01	3700000
1970-01-01	3900000
1971-01-01	4300000
1972-01-01	4700000
1973-01-01	4700000
1974-01-01	4600000
1975-01-01	4700000
1976-01-01	4900000
1977-01-01	5200000
1978-01-01	5300000
1979-01-01	5100000
1980-01-01	5000000
1981-01-01	5200000
1982-01-01	5500000
1983-01-01	5700000
1984-01-01	6200000
1985-01-01	6500000
1986-01-01	7000000
1987-01-01	7000000
1988-01-01	7100000
1989-01-01	7200000
1990-01-01	7000000
1991-01-01	6900000
1992-01-01	6600000
1993-01-01	6500000
1994-01-01	6400000
1995-01-01	6600000
1996-01-01	6900000
1997-01-01	7400000
1998-01-01	7900000
1999-01-01	8500000
2000-01-01	8800000
2001-01-01	8200000
2002-01-01	8500000
2003-01-01	8800000
2004-01-01	9100000
2005-01-01	9600000
2006-01-01	10000000
2007-01-01	11000000
2008-01-01	11000000
2009-01-01	10000000
2010-01-01	10000000
2011-01-01	11000000
2012-01-01	11000000
2013-01-01	11000000
2014-01-01	12000000
2015-01-01	12000000
2016-01-01	13000000