Year	constant 2015 US$
1960	17371063000
1961	18840149000
1962	20399728000
1963	21773121000
1964	21572688000
1965	23659826000
1966	21852487000
1967	18323789000
1968	20463904000
1969	17158951000
1970	15221738000
1971	14298910000
1972	17432402000
1973	11090379000
1974	14077964000
1975	14594091000
1976	14497583000
1977	14658830000
1978	16567568000
1979	12657315000
1980	17693252000
1981	13108141000
1982	17508133000
1983	16594774000
1984	17275421000
1985	18069541000
1986	18015711000
1987	16742613000
1988	17997188000
1989	13114373000
1990	18769767000
1991	17954701000
1992	18251258000
1993	15412448000
1994	14799050000
1995	10758266000
1996	13448094000
1997	9698086000
1998	12255387000
1999	12564255000
2000	13372310000
2001	15010836000
2002	17190719000
2003	20696633000
2004	24321218000
2005	33404349000
2006	27300841000
2007	24620948000
2008	29300910000
2009	31714054000
2010	32227810000
2011	32970623000
2012	32046154000
2013	32168863000
2014	33451535000
2015	30985540000
2016	33972650000