Year	Percent
1991	24.182
1992	24.279
1993	24.225
1994	24.234
1995	24.096
1996	23.963
1997	24.009
1998	24.268
1999	24.142
2000	24.23
2001	24.455
2002	24.534
2003	24.646
2004	24.763
2005	24.813
2006	25.308
2007	25.962
2008	26.164
2009	26.36
2010	26.204
2011	25.916
2012	26.201
2013	26.577
2014	26.87
2015	27.222
2016	27.392
2017	27.015
2018	27.134
2019	27.255
2020	27.356
2021	27.482
2022	27.662