Year	Percent
1991	22.198
1992	22.101
1993	22.249
1994	22.31
1995	22.599
1996	22.646
1997	22.588
1998	23.177
1999	23.304
2000	23.341
2001	23.22
2002	23.355
2003	23.443
2004	23.484
2005	23.695
2006	23.967
2007	24.269
2008	25.009
2009	25.074
2010	25.476
2011	25.471
2012	24.854
2013	25.134
2014	24.644
2015	24.597
2016	24.548
2017	24.888
2018	24.798
2019	24.731
2020	24.716
2021	24.665
2022	24.618