Year	Percent
1984	7.82
1990	5.45
1991	4.27
1992	4.13
1993	2.92
1994	2.73
1995	3.89
1998	4.64
1999	6.06
2000	7.07
2001	7.67
2002	9.13
2003	9.35
2004	6.23
2005	5.76
2006	5.59
2007	4.38
2008	4.06
2009	3.58
2010	2.95
2011	2.62
2012	2.22
2013	2.47
2014	2.55
2015	3.14
2016	3.48
2017	2.98
2018	3.45
2019	3.86
2020	4.67