Year	Percent
1990	3.24
1991	3.19
1992	4.53
1993	6.39
1994	5.98
1995	5.45
1996	4.94
1997	6.45
1998	6.07
1999	6.16
2000	5
2001	5.63
2002	5.59
2003	8.5
2004	7.71
2005	8.76
2006	7.7
2007	7.13
2008	7.02
2009	8.48
2010	8.22
2011	7.7
2012	8.33
2013	8.75
2014	8.6
2015	8.82
2016	8.58
2017	8.07
2018	7.95
2019	8
2020	8.61