Year	Percent
1986	5.91
1987	5.51
1992	3.94
1996	4.3
2001	7.92
2002	7.36
2003	6.73
2004	6.21
2005	5.37
2006	5.31
2007	5.02
2008	5.2
2009	6.33
2010	6.17
2011	5.51
2012	5.45
2013	4.91
2014	4.91
2015	4.77
2016	5
2017	4.87
2018	4.69
2019	5.79
2020	9.64