Year	current US$
1991	208.49100496310828
1992	135.1071742711014
1993	141.4963855055576
1994	135.27829837401686
1995	124.94561636857215
1996	177.27457718600823
1997	218.37348691660566
1998	242.1799150639876
1999	283.2721686408181
2000	253.13319623509577
2001	228.63807740185345
2002	214.39004652083136
2003	262.94897333776106
2004	325.7077040947201
2005	358.16318726358134
2006	363.45307360441916
2007	409.0781966512593
2008	478.2292323818178
2009	454.65971963390274
2010	402.07601744900415
2011	503.76064608943585
2012	556.9980359235533
2013	553.9472880432315
2014	553.2255036994392
2015	473.69038972770284
2016	341.67462819671357
2017	356.41218532068933
2018	395.9129653960399
2019	389.8484107090384
2020	340.88112601374314
2021	366.2556650601308