Year	constant 2015 US$
1995	17692.806388031644
1996	22474.143017516508
1997	24052.014695855883
1998	24848.1451968366
1999	24911.05486270103
2000	27558.49914193085
2001	26969.407167252513
2002	28680.607931739334
2003	28971.429073942913
2004	28464.54885549441
2005	25681.943725864705
2006	28934.571822889367
2007	32196.359696695476
2008	35415.06380405893
2009	36028.82776760591
2010	37055.552246975305
2011	40420.7920167748
2012	37197.5227276156
2013	42712.362633160796
2014	42200.579183974805
2015	44169.695419779484
2016	43943.80939043331
2017	40004.22308880373
2018	43439.01894945146
2019	41702.18722495416
2020	43939.03733511561
2021	43492.43234190472
2022	36001.475582017796