Year	constant 2010 US$
1980	21184.9828376582
1981	19295.58521837
1982	17290.8180745626
1983	17906.0163509295
1984	18304.6625974105
1985	16926.4554561154
1986	16571.5031291748
1987	17663.5443960249
1988	18240.7230301211
1989	17702.4859789043
1990	17934.7430502843
1991	19407.6340079877
1992	20178.5037375559
1993	22218.0376236775
1994	21623.2124036681
1995	21910.3176182421
1996	22220.759706765
1997	22281.7576549435
1998	22634.9622350898
1999	22761.1300154709
2000	22955.1971113414
2001	22416.2103892739
2002	22038.3911552775
2003	22058.8483076681
2004	22144.5801261696
2005	22066.1703958395
2006	21795.9241719605
2007	21837.484301022
2008	21562.6640288909
2009	20796.1804106802
2010	20722.1372891348
2011	20516.6503268878
2012	20925.6094489568
2013	21805.9847009115
2014	22396.0791053192
2015	22436.2729506264
2016	22336.7568224844
2017	22126.6653331896
2018	21438.5910783266