Year	Percent
1988	1.20825
1989	1.95285
1990	3.37913
1991	2.59765
1992	5.01917
1993	2.34506
1994	19.82451
1995	1.33042
1996	1.10341
1997	0.3103
1998	0.36978
1999	1.36567
2000	0.17037
2001	0.17857
2002	0.15325
2003	0.10969
2004	0.11675
2006	0.34321
2007	0.47629
2008	0.29924
2009	0.52047
2010	3.01095
2011	2.69534
2013	1.43159
2014	0.12989
2015	2.71709
2016	1.91051