Year	current US$
1967	286.12061975304727
1968	323.8628304322048
1969	357.98781491544094
1970	391.05977598757613
1971	431.48128035769724
1972	524.8491481760897
1973	638.7073109838245
1974	931.8743494316702
1975	1253.1643668162055
1976	1672.686285284655
1977	1773.9994947417363
1978	1892.7968389737798
1979	2326.522610507085
1980	2731.4882879580273
1981	2962.2015649850414
1982	2910.6052686926746
1983	2706.7922580799996
1984	2620.8192371477426
1985	2629.933338451964
1986	2698.986210999236
1987	2697.567736868597
1988	2649.26968404612
1989	2530.4523541172875
1990	2761.9658788955735
1991	2231.259745102964
1992	2352.479424112473
1993	2308.2043550815943
1994	2345.747191892543
1995	2410.1802276638687
1996	2575.518287400953
1997	2710.9429225652325
1998	2698.8439851943567
1999	2675.001651525773
2000	2874.7570995775613
2001	2968.322339536883
2002	2922.973977576382
2003	3129.2902510688014
2004	3594.0407493723706
2005	4095.188055815321
2006	4681.5543940071175
2007	5370.140734394735
2008	6226.919290995559
2009	6416.44171483512
2010	6852.122721659496
2011	7327.608865750041
2012	8258.56955250806
2013	8672.515181720695
2014	8628.7930604247
2015	7978.759725880959
2016	7584.896129746656
2017	7236.399275828555
2018	7447.114925519709
2019	7558.913463019128
2020	6963.852802622781
2021	7531.44753354008
2022	8412.305290398379
2023	8731.838035212975