Year	current US$
1980	169.53028166148127
1981	173.6863374713986
1982	168.2542951651991
1983	183.98334855429357
1984	161.6023970277337
1985	185.76465905584675
1986	183.80039012433906
1987	164.84237017675315
1988	153.13119235307255
1989	154.2152582624363
1990	149.24978835915397
1991	153.81949259042995
1992	135.93148104286442
1993	121.16274965500702
1994	114.09218868933401
1995	103.8837654369961
1996	82.30504001201264
1997	101.04305596646613
1998	87.82512252241713
1999	92.0441107053068
2000	101.21546889014465
2001	90.25057410130148
2002	75.84591816147856
2003	50.803189573232224
2004	68.94537640488879
2005	87.82182220490498
2006	104.4613175709793
2007	89.58957315869075
2008	102.16367675124259
2009	111.86338473121867
2010	137.80193622998803
2011	143.93354561226295
2012	163.6322631376148
2013	168.7638750926625
2014	180.9316159655559
2015	208.08039188802093
2016	165.44732051076886
2017	165.85112159083428
2018	168.28115571472398
2019	157.4754851231461
2020	154.90395137468315
2021	155.91427977475084