Year	Percent
1995	28.66432
1996	29.117
1997	34.50601
1998	33.86649
1999	27.45763
2000	28.84351
2001	30.0987
2002	33.12371
2003	35.27742
2004	34.53915
2005	33.18469
2006	39.3466
2007	39.29221
2008	30.7184
2009	20.71074
2010	21.27519
2011	25.1065
2012	29.09033
2013	26.90701
2014	27.10282
2015	24.94114
2016	24.24264
2017	25.36399