Year	constant 2010 US$
1991	19662.7644550663
1992	19465.1262503207
1993	18997.5962023721
1994	22660.2967266322
1995	23548.7440979844
1996	23471.6064346271
1997	30347.1717062144
1998	30533.4498573092
1999	30827.4336056835
2000	31303.1654664065
2001	31381.9505564512
2002	31377.3622648039
2003	31364.6307205211
2004	31292.1386837809
2005	31525.8194708424
2006	31451.7257601138
2007	32189.6564910035
2008	32020.494367784
2009	31272.9814065103
2010	31418.7327140876
2011	31541.3331911631
2012	31522.0043641032
2013	31445.8398226691
2014	31434.4489247828
2015	31589.639235215
2016	31657.7539324958
2017	31771.3221289078
2018	23652.8927059652