Year	Percent
1996	2.4
1997	5
1998	14.53
1999	13.8
2000	10.82
2001	11.16
2002	12.59
2003	11.51
2004	12.62
2005	13.81
2006	13.57
2007	13.28
2008	17.87
2009	20.71
2010	20.2
2011	19.63
2012	19.65
2013	19.42
2014	17.44
2015	16.51
2016	16.6
2017	13.94
2018	12.67
2019	11.57
2020	18.5