Year	constant 2015 US$
1990	19710.892006572223
1991	20069.757474729133
1992	19177.783442395965
1993	18102.881036200466
1994	18462.409794161802
1995	18759.508613928647
1996	19597.22767498709
1997	20659.63006883703
1998	22847.701790089763
1999	24216.32278137063
2000	24830.285607612685
2001	23818.95290027429
2002	23436.188731382725
2003	24656.621385455917
2004	26188.31576212242
2005	28783.759550456994
2006	29198.305525347507
2007	30352.7894232419
2008	27798.616269755963
2009	24241.22532881895
2010	24212.59026642472
2011	24656.22090198459
2012	24971.657869720617
2013	25000.835720985408
2014	25442.590958545432
2015	26308.39785045729
2016	27692.851477938802
2017	29205.50279144784
2018	29807.057630173975
2019	29667.68894577518
2020	28283.270289642816
2021	29756.176227328124
2022	31425.3775658451
2023	30656.97847468251