Year	Percent
1991	0.96831
1993	3.72299
1995	3.23309
1996	3.36494
1997	3.17922
1998	2.23414
1999	2.00057
2000	2.12594
2001	1.83058
2002	1.63744
2003	1.58231
2004	1.75891
2005	1.55616
2006	1.42619
2007	1.17979
2008	0.91012
2009	0.978
2010	1.1471
2011	0.97774
2012	0.99815
2013	1.06447
2014	1.21424
2015	1.45862
2016	1.44722
2017	1.31876