Year	US Dollars adjusted for inflation)
1992	165000000
1993	82000000
1994	236000000
1995	167000000
1996	234000000
1997	558000000
1998	708000000
1999	732000000
2000	270000000
2001	512000000
2002	310000000
2003	313000000
2004	196000000
2005	288000000
2006	524000000
2007	635000000
2008	399000000
2009	442000000
2010	513000000
2011	566000000
2012	1491000000
2013	683000000
2014	630000000
2015	299000000
2016	455000000
2017	375000000
2018	254000000
2019	165000000
2020	116000000
2021	147000000
2022	50000000