Year	constant 2015 US$
1991	4005.295955898475
1992	3889.2977196282723
1993	3810.9322780724046
1994	3768.6902669384967
1995	3709.952997765398
1996	3330.8737121427207
1997	3262.4965388632545
1998	3109.493112211404
1999	3062.133955190523
2000	3037.3685530305715
2001	3048.487525626425
2002	2984.2993047518885
2003	2867.33059757145
2004	2895.853210688508
2005	2952.532068661953
2006	2882.4319465838844
2007	2845.7921974792234
2008	2764.0697209714895
2009	2748.2340415313233
2010	2651.197530227425
2011	2658.7033269058893
2012	2363.006357443582
2013	2428.061803284829
2014	2483.258866576368
2015	2522.3216656266363
2016	2473.854306324203
2017	2430.5112751040338
2018	2398.2909853672722
2019	2413.0574511071827
2020	2418.929599548995
2021	2453.2374605479135
2022	2405.074834855926