Year	current US$
1980	278.7856239914494
1981	249.1264159536733
1982	262.59674633408264
1983	225.87504366771313
1984	219.15317018428453
1985	299.92047817120374
1986	381.5714436242211
1987	394.00397100902893
1988	410.49889300341897
1989	394.9219213666634
1990	449.7249133074756
1991	417.8324559233375
1992	414.1718011803316
1993	361.33177641123467
1994	236.2618065134238
1995	303.901497243435
1996	261.87846627969776
1997	240.6544492321042
1998	242.953946939753
1999	247.45669373162397
2000	219.9597698198355
2001	220.88400358673735
2002	230.89365597739814
2003	259.851518349093
2004	282.25694790097685
2005	292.4542157195152
2006	314.1924732112365
2007	359.455690390187
2008	408.3921169035016
2009	416.02296708974836
2010	419.94199259778884
2011	460.7545921656176
2012	468.9683845365267
2013	295.71046808908955
2014	325.41736432264423
2015	293.402626903364
2016	311.42639081167545
2017	361.3537852011941
2018	382.50670000606306
2019	373.0588143855268
2020	369.28344448684453
2021	391.03961542643106