Year	Percent
1991	2.64
1992	3.79
1993	4.765
1994	4.979
1995	4.3017
1996	2.7393
1997	3.3824
1998	3.4046
1999	2.3724
2000	2.2143
2001	1.8725
2002	2.7771
2003	2.2221
2004	1.5993
2005	1.7062
2006	2.0139
2007	1.5184
2008	1.6964
2009	4.9459
2010	5.6252
2011	5.6901
2012	4.4053
2013	4.957
2014	4.9607
2015	3.7324
2016	2.7671
2017	1.9777