Year	current US$
2001	155000000
2002	113000000
2003	124000000
2004	181000000
2005	191000000
2006	224000000
2007	233000000
2008	242000000
2009	254000000
2012	92000000
2013	96000000
2014	79000000
2015	147000000
2016	144000000
2017	177000000
2018	190000000
2019	217000000
2020	38000000