Year	constant 2015 US$
1972	1590.380276265756
1973	1774.995756864167
1974	2099.874644085023
1975	2115.033355833049
1976	2324.70188521474
1977	2274.1390220100034
1978	2141.8536138179716
1979	2148.9083219753875
1980	1922.2609937523043
1981	1865.5679633404327
1982	2011.7936319771109
1983	2058.025026239518
1984	2056.3857251637883
1985	2051.8948779094558
1986	1940.242023182921
1987	2042.7418705451569
1988	1887.0056839231036
1989	1932.568431925415
1990	1987.132803139352
1991	2013.1275400204693
1992	2036.623108249613
1993	2113.8713005123213
1994	2122.5389579232533
1995	2109.5177060064684
1996	2195.4302594300116
1997	2190.9766972830244
1998	2211.093618894467
1999	2302.404995273642
2000	2353.164114885486
2001	2413.595009153258
2002	2491.0821127615905
2003	2557.522331765245
2004	2651.686778135267
2005	2747.1803668973907
2006	2857.2318533111616
2007	3024.945621020633
2008	3112.214953754808
2009	3113.9635664538914
2010	3206.1766798112553
2011	4179.183759486523
2012	4085.48290392883
2013	3986.6758599950963
2014	3937.8150210014987
2015	3829.448319149124
2016	4003.3539561356106
2017	4065.426494455126
2018	4008.4567486269693
2019	3915.5529763474897
2020	3667.773623753453
2021	3898.621660161001
2022	3994.901766953569