Year	Percent
1992	4.7
2000	10.18
2001	8.19
2002	7.75
2003	8.9
2004	8.66
2005	13.91
2006	9.98
2007	10.16
2008	9.04
2009	13.81
2010	16.6
2011	22.38
2012	27.75
2013	38.91
2014	35.95
2015	32.77
2016	29.06
2017	24.7
2018	20.17
2019	16.6
2020	18.23