Year	Percent
1987	5.83389
1988	6.34124
1989	6.2512
1990	4.28139
1991	3.23154
1992	1.90944
1993	1.71236
1994	1.65436
1995	1.62051
1996	1.77695
1997	1.63873
1998	1.90654
1999	1.83501
2000	2.02248
2001	1.78166
2002	1.79557
2003	1.50969
2004	1.38273
2005	1.18083
2006	1.13847
2007	1.31284
2008	1.17206
2009	0.82379
2010	0.763
2011	0.83727
2012	0.92431
2013	0.82231
2014	0.85963
2015	0.86561
2016	0.84837
2017	0.7371