Year	constant 2011 international $
1990	2819.54946749144
1991	2906.27284905597
1992	2591.00753357644
1993	2572.87039454223
1994	2768.30995334982
1995	2736.48643557488
1996	2985.85660491882
1997	3036.42222417014
1998	3099.07618176202
1999	3054.06418935275
2000	2945.99321170012
2001	2977.768505326
2002	2706.03149428103
2003	2240.903025523
2004	2104.14351235547
2005	1974.64508141424
2006	1893.93622985393
2007	1809.791702428
2008	1475.14065256759
2009	1632.99986557872
2010	1928.01708073514
2011	2168.11029336035
2012	2486.84793026389
2013	2491.63513985282
2014	2506.49021994012
2015	2509.00814024701
2016	2489.09749352291
2017	2568.4100720042
2018	2688.40694206013