Year	Percent
1991	25.611
1992	25.6
1993	25.605
1994	25.644
1995	25.626
1996	25.715
1997	25.774
1998	25.79
1999	25.845
2000	25.966
2001	25.965
2002	25.998
2003	25.981
2004	26.014
2005	26.024
2006	26.065
2007	26.193
2008	26.27
2009	26.355
2010	26.386
2011	26.477
2012	26.566
2013	26.703
2014	26.84
2015	26.985
2016	27.054
2017	27.086
2018	27.123
2019	27.159
2020	27.204
2021	27.253
2022	27.298