Year	Percent
1990	5.83
1991	5.97
1992	5.98
1993	5.98
1994	5.84
1995	5.58
1996	5.45
1997	5.16
1998	4.84
1999	4.71
2000	4.18
2001	4.01
2002	4.06
2003	3.97
2004	3.79
2005	3.85
2006	4.09
2007	4.46
2008	4.54
2009	4.91
2010	4.74
2011	4.64
2012	4.73
2013	5.15
2014	4.97
2015	5.69
2016	6.31
2017	6.4
2018	7.19
2019	7.25