Year	current US$
2003	8000000
2004	7000000
2005	8000000
2006	8000000
2007	8000000
2008	13000000
2009	8000000
2010	16000000
2011	13000000
2012	31000000
2013	18000000
2014	15000000
2015	18000000
2016	20000000
2017	23000000
2018	45000000
2019	154000000
2020	264000000
2021	616000000
2022	473000000
2023	295000000