Year	constant 2010 US$
1991	3320.077393222
1992	3549.73699739884
1993	3553.72387074863
1994	3183.19637185557
1995	3196.16655865567
1996	3029.92264356602
1997	3066.01248451953
1998	2996.70603253779
1999	2959.95379980699
2000	3198.32360360355
2001	3173.64591574528
2002	3151.62023227858
2003	3116.11340950081
2004	3070.7748430178
2005	3058.38411460695
2006	3036.10781732724
2007	2959.43437535956
2008	2917.62554109531
2009	2958.92802383149
2010	2921.01215431629
2011	2891.14276349378
2012	2750.9484589427
2013	2800.73266048846
2014	2677.89013104398
2015	2582.49692634633
2016	2507.03355581257
2017	2473.73152740808