Year	Percent
1991	25.447
1992	24.9
1993	24.536
1994	24.81
1995	24.871
1996	24.688
1997	24.499
1998	25.471
1999	25.602
2000	25.599
2001	24.974
2002	25.775
2003	25.355
2004	25.547
2005	25.508
2006	26.304
2007	26.563
2008	26.046
2009	29.53
2010	29.432
2011	29.938
2012	29.968
2013	30.156
2014	29.157
2015	29.195
2016	29.162
2017	29.156
2018	29.188
2019	29.206
2020	29.201
2021	29.193
2022	29.19