Year	US Dollars
1962	1610
1963	1710
1964	1860
1965	2050
1966	2240
1967	2470
1968	2630
1969	2850
1970	3120
1971	3570
1972	4230
1973	5320
1974	6750
1975	8380
1976	9150
1977	9960
1978	11110
1979	13110
1980	15650
1981	16420
1982	15750
1983	14940
1984	15150
1985	15710
1986	17550
1987	20830
1988	23970
1989	25080
1990	26510
1991	27830
1992	30790
1993	30220
1994	30860
1995	32700
1996	35800
1997	37920
1998	36110
1999	35550
2000	36560
2001	38250
2002	39900
2003	44760
2004	54110
2005	63790
2006	69980
2007	78410
2008	87360
2009	87850
2010	88440
2011	90280
2012	99100
2013	104340
2014	104540
2015	93050
2016	82010
2017	75990