Year	current US$
1995	472000000
1996	485000000
1997	515000000
1998	469000000
1999	418000000
2000	470000000
2001	445000000
2002	465000000
2003	498000000
2004	586000000
2005	646000000
2006	664000000
2007	636000000
2008	670000000
2009	678000000
2010	693000000
2011	754000000
2012	675000000
2013	650000000
2014	689000000
2015	598000000
2016	468000000
2017	513000000
2018	455000000
2019	498000000
2020	326000000