Year	constant 2010 US$
1991	336.615942653496
1992	248.499598807814
1993	381.6277045886
1994	274.550412192454
1995	384.7759486466
1996	478.379372782327
1997	474.106690371556
1998	507.862158212104
1999	545.303483789419
2000	557.345012917635
2001	509.320474527807
2002	526.779068430158
2003	534.539780093232
2004	542.307610879964
2005	479.565844222572
2006	444.414452517012
2007	466.688561489463
2008	469.783781605848
2009	478.063106419263
2010	497.321705219022
2011	504.550665884631
2012	488.000841528084
2013	502.961343940336
2014	516.750106645286
2015	490.280328318428
2016	463.504692790089
2017	470.223491702668