Year	current US$
1995	11970100000
1996	11776390000
1997	8525200000
1998	7999200000
1999	4842150000
2005	3973680000
2006	12192470000
2007	13812380000
2008	21288130000
2009	30241650000
2010	47487830000
2011	32598537000
2012	37395660000
2013	28085680000
2014	16369770000
2015	19585170000
2016	21455400000
2017	35365880000
2018	17497710000
2019	12985300000
2021	7239910000
2022	13007730000