Year	Percent
1991	23.64
1992	24.348
1993	23.958
1994	23.679
1995	23.541
1996	23.838
1997	23.595
1998	23.61
1999	23.92
2000	23.337
2001	23.685
2002	24.199
2003	23.849
2004	23.693
2005	23.995
2006	23.547
2007	23.453
2008	23.308
2009	23.654
2010	24.032
2011	24.4
2012	25.283
2013	26.06
2014	26.494
2015	26.384
2016	26.221
2017	25.626
2018	25.873
2019	26.09
2020	26.136
2021	26.635
2022	27.205