Year	constant 2015 US$
1980	249.862320619307
1981	257.2519610486807
1982	234.23310982393497
1983	193.21332021389932
1984	176.83244428844927
1985	175.02535737614036
1986	167.95681136331518
1987	191.82926673354262
1988	207.68774868410372
1989	218.9763314876603
1990	217.5775534509254
1991	223.95573583233093
1992	203.15672911993468
1993	219.20553616781245
1994	222.2672057121473
1995	217.05968923831603
1996	233.0330014678044
1997	253.5922025501611
1998	273.2479562947666
1999	298.2296003548588
2000	293.2318956263771
2001	322.70425682830114
2002	344.9275175459183
2003	360.3437888415392
2004	379.8583664033343
2005	393.5109547610178
2006	421.56287400773294
2007	442.1975158421635
2008	460.3873993764193
2009	474.83571783576167
2010	492.56757239102114
2011	512.4563953459326
2012	536.9901036234694
2013	554.9607558977192
2014	579.642369195999
2015	603.8385137779147
2016	612.7245153233932
2017	609.6735490780882
2018	612.5990286457826
2019	608.9636327624398
2020	584.3149620763442
2021	581.444300104411
2022	590.3689083799867
2023	602.9199793626959