Year	constant 2010 US$
1991	26018.0953575635
1992	27609.8401102319
1993	24813.5951554859
1994	24462.8969598492
1995	24629.8962202982
1996	24871.048230334
1997	23286.9066367691
1998	23930.0452212778
1999	22435.7217433717
2000	23556.0561446288
2001	23883.9358173956
2002	24157.8060321853
2003	21897.5159588274
2004	26942.6201360655
2005	25761.1847705921
2006	25382.7678629179
2007	24450.6374859969
2008	27022.203961604
2009	30236.801985308
2010	27767.8627775086
2011	28825.5097955573
2012	27318.3995609479
2013	25521.9951884767
2014	26551.6372755466
2015	25443.2216542455
2016	25162.6478705968
2017	27429.6073117785
2018	27841.6702561316