Year	current US$
1991	0.7518732641914639
1992	6.280502261942955
1993	31.66009537494566
1994	56.694213251826994
1995	65.52040028923564
1996	88.59928339078596
1997	50.8250563738602
1998	59.94661230557652
1999	65.26451888883261
2000	68.13584733001719
2001	67.4947412767677
2002	95.07777241324435
2003	81.19056824206334
2004	83.54249786501748
2005	56.647869951158526
2006	71.16834486914793
2007	88.57362713585174
2008	76.16759602254056
2009	93.47919576975985
2010	108.71967157516886
2011	128.3690922132428
2012	92.83490530660944
2013	96.62970800206213
2014	92.53857106427526
2015	120.7116704455917
2016	113.90397307443764
2017	90.3039838540248
2018	49.99723514254042
2019	147.9471360344242
2020	45.11678104391454
2021	58.02633666535123
2022	108.02134679563629