Year	Percent
1986	14.2
1991	11.1
1996	9.1
2002	12.8
2004	10.3
2005	11.81
2006	11.52
2007	10.77
2008	10.63
2009	12.11
2010	13.68
2011	12.49
2012	12.27
2013	10.6
2014	10.68
2015	11.17
2016	12.62
2017	12.23
2018	12.19
2019	10.74
2020	9.69