Year	current US$
1999	8203000000
2000	8378000000
2001	9759000000
2002	10214000000
2003	13297000000
2004	16250000000
2005	19120000000
2006	22980000000
2007	22933000000
2008	25694000000
2009	21339000000
2010	19748000000
2011	20866000000
2012	18833000000
2013	18441000000
2014	19099000000
2015	17139000000
2016	15796000000
2017	15761000000
2018	16412000000
2019	16451000000
2020	13839000000
2021	16800000000
2022	17313000000
2023	17148000000