Year	current US$
1995	25000000
1996	24000000
1997	23000000
1998	25000000
1999	30000000
2000	40000000
2001	88000000
2002	104000000
2003	128000000
2004	140000000
2005	148000000
2006	175000000
2007	221000000
2008	275000000
2009	192000000
2010	205000000
2011	210000000
2012	142000000
2013	178000000
2014	212000000
2015	186000000
2016	201000000
2017	206000000
2018	227000000