Year	Percent
1990	7.40515
1991	7.13558
1992	6.79369
1993	6.54488
1994	5.93916
1995	5.77272
1996	4.54823
1997	4.41387
1998	4.28939
1999	4.16959
2000	4.71892
2001	4.55945
2002	4.4054
2003	4.25841
2004	4.09267
2005	3.96374
2006	3.8523
2007	3.75313
2008	3.65728
2009	3.56884
2012	0.36943
2013	0.36095
2014	0
2020	0