Year	constant 2015 US$
1999	12707.296390334228
2000	13315.95016904742
2001	13065.123219024164
2002	13298.916723958624
2003	13273.513753488904
2004	13005.076351726819
2005	12858.09469804216
2006	12716.929163388017
2007	13135.856196493054
2008	13117.42840556233
2009	13378.230466957786
2010	13568.915756871816
2011	13813.618837556
2012	14203.97512049343
2013	14076.022852256017
2014	15604.42703874193
2015	15679.70607940017
2016	15577.966837522517
2017	16370.003223968173
2018	16656.331209146494
2019	16653.921229953194
2020	17141.831125714984
2021	17123.919131323444
2022	16390.014299632825