Year	Percent
1991	9.71
1992	10.07
1993	10.364
1994	10.662
1995	10.752
1996	10.673
1997	10.94
1998	11.009
1999	10.83
2000	10.91
2001	11.167
2002	11.121
2003	11.4
2004	12.099
2005	12.403
2006	12.175
2007	12.03
2008	11.692
2009	11.628
2010	11.621
2011	11.714
2012	11.616
2013	11.236
2014	10.992
2015	10.786
2016	10.446
2017	10.438
2018	10.374
2019	10.318
2020	10.277
2021	10.24
2022	10.209