Year	Percent
1991	22.973
1992	23.22
1993	21.759
1994	21.665
1995	22.196
1996	23.95
1997	22.156
1998	22.549
1999	22.373
2000	22.405
2001	23.025
2002	22.614
2003	22.686
2004	24.642
2005	24.301
2006	24.561
2007	24.27
2008	23.737
2009	23.454
2010	22.644
2011	23.892
2012	24.32
2013	23.865
2014	23.665
2015	23.992
2016	23.511
2017	23.673
2018	23.775
2019	24.008
2020	24.044
2021	24.17
2022	24.31