Year	Percent
1991	23.863
1992	24.491
1993	25.389
1994	25.595
1995	25.697
1996	25.818
1997	25.909
1998	25.834
1999	25.985
2000	25.888
2001	26.185
2002	26.296
2003	26.691
2004	24.914
2005	25.23
2006	25.286
2007	25.259
2008	25.619
2009	26.008
2010	25.77
2011	25.745
2012	25.906
2013	26.048
2014	26.35
2015	26.379
2016	26.325
2017	26.066
2018	25.704
2019	25.526
2020	25.381
2021	25.217
2022	25.09