Year	Percent
1995	13.52857
1996	12.80984
1997	13.95082
1998	14.88439
1999	15.56535
2000	15.03656
2001	12.29946
2002	12.61927
2003	12.37546
2004	11.05881
2005	11.73193
2006	9.51763
2007	8.74551
2008	11.44931
2009	9.62025
2010	9.43176
2011	10.07448
2012	9.79079
2013	8.0584
2014	8.41391
2015	9.06581
2016	9.69374