Year	current US$
1991	743.4525969968863
1992	776.1813812416973
1993	780.9894112755962
1994	785.5800316218305
1995	789.7751965012508
1996	758.3938039986272
1997	740.749629523545
1998	722.237398578517
1999	733.602295456471
2000	736.0634528512452
2001	735.5800001573947
2002	738.3481697378161
2003	764.2020180324027
2004	802.4018642281612
2005	833.9551626308287
2006	878.1966523798998
2007	914.3085463897152
2008	1036.957461167187
2009	1005.0752678889605
2010	985.4151163679105
2011	1084.3218545898906
2012	1170.867125693123
2013	1632.8910320004468
2014	1887.269792928327
2015	2072.1491833472396
2016	2107.8711056851575
2017	2132.7916811334862
2018	2319.1730540850153
2019	2456.5989798359765
2020	2515.6395235333935
2021	2786.292473459704