Year	Percent
1990	8.31
1991	10.88
1992	7.56
1993	8.2
1994	8.17
1995	11.37
1996	12.17
1997	11.72
1998	11.79
1999	13.43
2000	10.97
2001	13.25
2002	14.1
2003	14.49
2004	14.21
2005	14.96
2006	13.77
2007	10.75
2008	10.79
2009	17.64
2010	16.98
2011	22.23
2012	22.59
2013	21.59
2014	24.36
2015	22.31
2016	21.54
2017	20.63
2018	25.43
2019	31.55
2020	40.68