Year	Percent
1992	3.824
1993	4.771
1994	7.318
1995	8.642
1996	8.857
1997	10.695
1998	11.777
1999	11.85
2000	9.609
2001	8.317
2002	7.35
2003	7.441
2004	6.878
2005	6.424
2006	6.457
2007	5.377
2008	5.507
2009	7.736
2010	6.7686
2011	5.9609
2012	4.8327
2013	4.9445
2014	4.643
2015	4.9546
2016	4.8874
2017	4.5397