Year	Percent
1986	6.78
1987	5.86
1992	5.54
1996	7.57
2001	11.92
2002	11.38
2003	10.27
2004	9.89
2005	8.45
2006	8.92
2007	8.15
2008	8.41
2009	9.09
2010	8.78
2011	7.97
2012	7.84
2013	7.36
2014	6.87
2015	6.81
2016	7.2
2017	7.51
2018	7.74
2019	8.54
2020	13.9