Year	current US$
1990	23813590.0939681
1991	23763397.756607
1992	24532655.9245386
1993	24875730.5367414
1994	26746683.2730763
1995	28052068.2199442
1996	27794348.5706695
1997	27416507.2715513
2000	23982998.3281831
2001	26747909.3920106
2002	31052674.1631305
2003	37185509.5384061
2004	42784459.6219194
2005	59002676.4193889
2006	64952696.5084488
2007	73026088.9631028
2008	90214234.2721015
2011	90653439.4668213
2012	104517758.352298
2013	123284793.085945
2014	127168989.273891
2015	99326832.6245087
2016	91047352.1045262
2017	96624094.7392323
2018	107806828.961361
2019	103233531.209805
2020	89253916.7061184
2021	114072762.231891