Year	current US$
1984	511.6048639944478
1985	511.13751559466493
1986	571.545431362371
1987	550.3898884805642
1988	520.8048564455297
1989	560.4326683639395
1990	491.20782806578467
1991	250.88316759947074
1992	136.0545677947604
1993	316.12843213011735
1994	508.9523164379948
1995	669.0436495468138
1996	914.5730378865088
1997	643.215894620855
1998	749.0727864042665
1999	949.097159329714
2000	1038.9566857387326
2001	1186.743382681234
2002	1308.2165516481723
2003	1699.3924893248652
2004	2171.0444204536498
2005	2437.801549598982
2006	2742.9336107387685
2007	3229.9772015363887
2008	3830.340927282536
2009	3517.6091529858218
2010	3509.842739337959
2011	3753.965485487136
2012	3522.3728571434085
2013	3757.6969462431935
2014	3844.277141014515
2015	3277.788243422314
2016	3467.347570154584
2017	3729.968218720899
2018	4340.919854057213
2019	4361.999292929626
2020	4322.549675333325
2021	5262.913596203887