Year	Percent
1988	1.71813
1989	3.84709
1990	16.33958
1991	95.61871
1992	1761.24257
1993	3334.80111
1994	953.46117
1995	415.80987
1996	66.14566
1997	18.0738
1998	12.01202
1999	27.39992
2000	23.11594
2001	9.94719
2002	5.12184
2003	8.2206
2004	15.15565
2005	24.55229
2006	14.87825
2007	22.75261
2008	28.58347
2009	13.07361
2010	13.41177
2011	14.20079
2012	7.79492
2013	4.33702
2014	15.90181
2015	38.88166
2016	17.1424
2017	22.11206