Year	constant 2010 US$
1991	2425.90026197782
1992	2498.25282913378
1993	2486.61138941537
1994	2728.4207882994
1995	2606.60621752979
1996	2707.99954893139
1997	2422.31403435364
1998	2222.47074080401
1999	2533.7938344061
2000	2511.0660813543
2001	2344.67502626198
2002	2433.3622697094
2003	2308.75211786463
2004	2410.61852851895
2005	2401.40888283327
2006	2468.66520360965
2007	2286.65109579303
2008	2201.91368210966
2009	1983.80823473251
2010	1894.3391644867
2011	2019.75616758668
2012	2056.54400394194
2013	2288.86132975792
2014	2455.17322864217
2015	2577.24294050726
2016	2312.82060438422
2017	2507.02172822591
2018	2630.54254899123