Year	Percent
1992	1.58
2000	4.53
2001	3.21
2002	2.77
2003	3.59
2004	3.72
2005	4.5
2006	4.13
2007	3.36
2008	3.16
2009	4.58
2010	5.38
2011	6.82
2012	10.48
2013	13.9
2014	13.86
2015	13.07
2016	11.72
2017	10.45
2018	7.77
2019	6.42
2020	7.08