Year	current US$
1960	4500000
1961	8800000
1962	7800000
1963	6400000
1970	3547670000
1971	3872010000
1972	4927380000
1973	6432020000
1974	8320559999.999999
1975	10282380000
1976	11016680000
1977	12265080000
1978	14113990000
1979	16368260000
1980	17016669999.999998
1981	13267120000
1982	11227250000
1983	11581740000
1984	11777610000
1985	11988748213
1986	12073690000
1987	12204841000
1988	13552493000
1989	13532754495
1990	13626836526
1991	14912548232
1992	13186372000
1993	14148436000
1994	17240862000
1995	22898722000
1996	24447732000
1997	25753905000
1998	28243902000
1999	27408030700
2000	31591609534
2001	36006132919
2002	41164341015
2003	53846026855
2004	75036026194
2005	89255713390
2006	110896000000
2007	140417000000
2008	171069000000
2009	136783000000
2010	159725000000
2011	188741000000
2012	185460000000
2013	205032000000
2014	220052000000
2015	199124000000
2016	203817000000
2017	234364000000
2018	263570000000
2019	266595000000
2020	271059000000