Year	Percent
1991	24.734
1992	23.423
1993	23.395
1994	23.27
1995	23.586
1996	23.272
1997	23.725
1998	23.978
1999	25.108
2000	26.565
2001	24.97
2002	25.394
2003	26.497
2004	24.301
2005	24.184
2006	26.112
2007	28.297
2008	24.382
2009	22.967
2010	23.957
2011	24.99
2012	24.08
2013	24.433
2014	24.551
2015	24.451
2016	24.339
2017	24.338
2018	24.339
2019	24.34
2020	24.341
2021	24.341
2022	24.341