Year	constant 2010 US$
1991	3298.57150472033
1992	3239.18158724179
1993	3238.55193209209
1994	3274.94145294571
1995	3108.95371232078
1996	3037.60131381857
1997	3066.65241027099
1998	3083.91319345715
1999	3128.61885619242
2000	3152.37847856642
2001	3174.10215118535
2002	2741.65772732011
2003	2806.41900963762
2004	2872.95015508645
2005	2974.96268517258
2006	2802.52780501241
2007	2632.87921829257
2008	2495.07457216002
2009	2124.05574249716
2010	1992.5670878832
2011	1794.63265505216
2012	1620.79691309197
2013	1617.60924026666
2014	1571.43146721147
2015	1576.38312566967
2016	1554.50171926477
2017	1576.92979999602