Year	current US$
1991	20586918090.74838
1992	21431433938.63494
1993	19917189163.61055
1994	21511389658.91286
1995	25740412174.150402
1996	26025474395.63296
1997	22814121362.508457
1998	21837279093.03101
1999	21036295528.185375
2000	19378314890.980434
2001	21081327819.685066
2002	18716686322.352974
2003	20820138178.039173
2004	26766290048.64872
2005	20695441680.93384
2006	22088494503.52938
2007	26680466467.451065
2008	31397687746.874992
2009	23719669866.406235
2010	27323020500.000053
2011	34119607159.533142
2012	29907310703.906258
2013	35196456157.255005
2014	35178700768.62733
2015	22989107093.74999
2016	24234536752.529243
2017	31436767778.823586
2018	27387516036.862724
2019	30757562156.862698
2020	28728516532.2958
2021	30460293945.735943
2022	37565404068.09353
2023	32228292709.80449