Year	current US$
1975	29000000
1976	57700000
1977	50120000
1978	37690000
1979	27730000
1980	67970000
1981	62390000
1982	79800000
1983	66330000
1984	76590000
1985	84100000
1986	87200000
1987	48090000
1988	78600000
1989	26000000
1990	13000000
1991	7200000
1992	250000
2003	21230000
2004	70140000
2005	100370000
2006	149490000
2007	103470000
2008	106940000
2009	116920000
2010	114340000
2011	139730000
2012	118380000
2013	128180000
2014	144030000
2015	155550000
2016	199120000
2017	148680000
2018	284940000
2019	312060000
2020	417880000
2021	435060000
2022	371280000