Year	Percent
1992	1.8
2000	3.48
2001	5.46
2002	3.52
2003	4.37
2004	5.34
2005	3.55
2006	3.26
2007	3.11
2008	3.25
2009	4.32
2010	4.73
2011	4.86
2012	9.67
2013	12.4
2014	16.27
2015	15.57
2016	11.5
2017	7.84
2018	5.78
2019	6.32
2020	5.8