Year	current US$
1970	4162.113913377702
1971	4508.968476240521
1972	5296.0444986603425
1973	6413.205134213928
1974	7050.944973378873
1975	8849.708765193336
1976	9468.32595677854
1977	9859.674543992152
1978	10825.374688420801
1979	12757.26197956974
1980	14680.603383412563
1981	13275.500183253223
1982	11593.428609099616
1983	10583.844633165001
1984	11050.520770037683
1985	11509.613443747701
1986	15273.82606029275
1987	18595.27996153792
1988	20852.66061919834
1989	21697.038439042954
1990	25680.582584909513
1991	26549.294041137353
1992	26897.011803852114
1993	19711.194006764876
1994	21623.408110878405
1995	25357.171908753306
1996	27555.750884238296
1997	25246.407112049747
1998	25552.046732452836
1999	26206.53854074454
2000	25025.380673076266
2001	22859.30562827542
2002	25085.752411421992
2003	31984.25532137044
2004	36331.38474370356
2005	37127.98038178709
2006	40452.40966429753
2007	46849.53731377177
2008	48848.586775591706
2009	39718.794797179224
2010	45188.85552974133
2011	51652.818109281056
2012	49429.39236991907
2013	52089.635275940775
2014	51104.43076524678
2015	43373.545425610966
2016	43610.18669700501
2017	45639.9405617351
2018	46269.20866664426
2019	44558.12293406543
2020	45322.00706985667
2021	51830.62661457461