Year	Percent
1992	5.931
1993	4.566
1994	4.443
1995	5.615
1996	3.662
1997	6.629
1998	8.813
1999	4.836
2000	5.629
2001	3.602
2002	2.038
2003	3.483
2004	3.605
2005	4.294
2006	2.425
2007	1.713
2008	3.471
2009	4.099
2010	4.0019
2011	2.7199
2012	3.0177
2013	2.4538
2014	2.8874
2015	2.9523
2016	3.1111
2017	3.7051