Year	current US$
1970	27901593.3140182
1971	26388310.5899913
1972	17015159.3344211
1973	30367013.9250224
1974	28180308.8630669
1993	96548961.9896115
1994	101764399.82888
1995	120057463.082264
1996	142680285.484631
1997	147938836.523812
1998	152583031.249648
1999	174493185.757169
2000	189214088.527762
2001	217637752.706576
2002	243543756.854633
2003	277974042.135948
2004	333678673.171845
2005	367910240.550524
2006	454099997.639279
2007	547953855.950708
2008	661749407.268512
2009	770686038.241144
2010	868426335.463894
2011	976506130.752383
2012	1062008847.26968
2013	1171084713.36748
2014	1399711465.32114
2015	1529858533.80253
2016	1769480902.42374
2017	2041218572.84205
2018	2317922618.45481
2019	2610589081.68964
2020	2562077145.16818
2021	2741464639.69665