Year	constant 2010 US$
1991	6287.27850451569
1992	6873.85657588037
1993	7003.66729570668
1994	7130.76122634414
1995	7705.27325017123
1996	7719.6622071475
1997	8348.24017705185
1998	8293.61085365003
1999	8518.85248189198
2000	8550.83249868741
2001	7958.1499461523
2002	7838.00049593802
2003	7531.24673344473
2004	7744.86598692898
2005	7242.85330119744
2006	7043.08915772274
2007	7185.09342575087
2008	6740.9574744873
2009	7034.69451296053
2010	7206.40873698313
2011	7358.71997449395
2012	6722.22871864835
2013	6342.31568929514
2014	6925.75996728699
2015	5770.37615488963
2016	5999.79707832696
2017	6603.25464719727
2018	6598.91319186799