Year	Percent
1991	14.559
1992	14.373
1993	14.338
1994	14.432
1995	14.281
1996	14.278
1997	12.713
1998	12.66
1999	12.699
2000	12.407
2001	12.344
2002	12.461
2003	12.461
2004	12.239
2005	12.125
2006	11.912
2007	11.845
2008	11.61
2009	11.549
2010	11.525
2011	11.715
2012	11.207
2013	11.295
2014	11.277
2015	11.087
2016	11.096
2017	11.085
2018	11.065
2019	11.049
2020	11.033
2021	11.019
2022	11.006