Year	US Dollars
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	21671001000
1995	25357999000
1996	26050001000
1997	30071801000
1998	24778637000
1999	24536864000
2000	25435196000
2001	24603875000
2002	33719581000
2003	37138448000
2004	43181221000
2005	44736852000
2006	59381328000
2007	72596572000
2008	69960358000
2009	79017426000
2010	108391607000
2011	116929482000
2012	144958642000
2013	139789842000
2014	141598627000
2015	138077503000
2016	146040322000