Year	Percent
1993	21.86
1994	20.85
1995	25.42
1996	22.53
1997	20.21
1998	18.7
1999	19.21
2000	20.29
2002	16.91
2003	15.89
2004	16.1
2005	19.28
2006	19.6
2015	15.27
2016	15.7