Year	Percent
1994	27.34
1995	24.76
1996	21.04
1997	22.63
1998	23.15
1999	32.04
2000	36.88
2001	38.89
2002	37.66
2003	32.91
2004	32.81
2005	30.05
2006	26.65
2007	20.34
2008	19.02
2009	27.28
2010	33.55
2011	33.43
2012	34.03
2013	33.67
2014	29.69
2015	26.46
2016	22.21
2017	18.93
2018	14.95
2019	16.11
2020	19.35