Year	Percent
1990	15.90291
1991	128.62977
1992	1490.41842
1993	887.84074
1994	307.29806
1995	144.00309
1996	45.8019
1997	15.05916
1998	18.53869
1999	72.38678
2000	37.6981
2001	16.48953
2002	15.49295
2003	13.78006
2004	20.28208
2005	19.30609
2006	15.17005
2007	13.80438
2008	17.95962
2009	1.9938
2010	14.18699
2011	23.64165
2012	9.08593
2013	5.40934
2014	7.50006
2015	8.35176
2016	3.54439
2017	5.20927