Year	constant 2015 US$
1992	10000
1993	10000
1994	299600000
1995	203490000
1996	89100000
1997	48620000
1998	122320000
1999	34710000
2000	42200000
2001	41650000
2002	37510000
2003	30320000
2004	23430000
2005	26460000
2006	42580000
2007	24780000
2008	45130000
2009	37720000
2010	28520000
2011	27600000
2012	11850000
2013	33830000
2014	23110000
2015	14360000
2016	17760000
2017	22340000