Year	Percent
1991	23.578
1992	23.737
1993	24.048
1994	24.224
1995	24.471
1996	24.436
1997	24.43
1998	21.776
1999	21.835
2000	21.881
2001	21.954
2002	21.988
2003	21.921
2004	21.995
2005	21.968
2006	21.953
2007	21.972
2008	21.962
2009	22.809
2010	22.21
2011	22.303
2012	23.281
2013	25.003
2014	24.366
2015	24.973
2016	25.145
2017	25.764
2018	26.266
2019	26.525
2020	26.504
2021	26.188
2022	26.083