Year	current US$
2000	3598000000
2001	3342000000
2002	3300000000
2003	4560000000
2004	6307000000
2005	7659000000
2006	8915000000
2007	11234000000
2008	12462000000
2012	18340000000
2013	19042000000
2014	20756000000
2015	21472000000
2016	23111000000
2017	27878000000
2018	29143000000
2019	31661000000
2020	13413000000