Year	Percent
1996	29.5
1997	22.85
1998	22.22
1999	22.48
2000	21.2
2001	21.86
2002	23.59
2003	21.92
2004	18.85
2007	11.75
2009	11.77
2010	13
2011	12.5
2012	12.12
2013	12.03
2014	16.53
2015	11.43
2016	10.41
2017	10.16