Year	Percent
1990	1.7
1991	8.5
1992	9.94
1993	12.1
1994	10.85
1995	10.17
1996	10.02
1997	8.99
1998	8.93
1999	6.93
2000	6.56
2001	5.67
2002	5.61
2003	5.79
2004	5.83
2005	7.19
2006	7.49
2007	7.41
2008	7.82
2009	10.03
2010	11.17
2011	11.03
2012	11
2013	10.18
2014	7.73
2015	6.81
2016	5.11
2017	4.16
2018	3.71
2019	3.42
2020	4.25