Year	constant 2010 US$
1989	29535.7497635806
1990	28226.5636542891
1991	26515.6792524594
1992	25725.3266025622
1993	24989.0291789282
1994	25317.4405957363
1995	30080.9563325852
1996	33100.6795466679
1997	27302.055888492
1998	28089.045173711
1999	30149.938751929
2000	30941.3389315103
2001	31079.530083493
2002	31452.7792922546
2003	30649.5011900107
2004	30439.3613910143
2005	30783.4085979799
2006	30899.0074702424
2007	30723.9235663993
2008	30002.7271143192
2009	28024.4923646911
2010	27858.8051005516
2011	27731.7713452626
2012	28498.2119398538
2013	28133.6005921705
2014	27452.601961246
2015	27550.0457882322
2016	26619.3348138533
2017	26883.5091380572