Year	constant 2015 US$
1991	8760.86108970699
1992	8311.697888395613
1993	7911.305127449233
1994	8093.107541652787
1995	7596.18817330055
1996	7690.624068933282
1997	7365.61361594023
1998	7671.215644821017
1999	7070.615770639145
2000	6466.795849675698
2001	5531.429717061723
2002	4936.651431791137
2003	4512.9094362208225
2004	4536.32520605955
2005	3608.007761782072
2006	3994.3502426995983
2007	4425.696747914689
2008	4480.1638820530925
2009	5285.342863625133
2010	5948.013183301363
2011	6970.100325958637
2012	8102.1358057651905
2013	9539.42817082523
2014	11067.132088798915
2015	12398.672254317607
2016	14140.070823382795
2017	16801.241189610228
2018	19853.529420949675
2019	23950.143583615783
2020	26236.971857823264
2021	34432.42344647665
2022	30212.9568939867