Year	Percent
1991	23.051
1992	24.26
1993	25.528
1994	26.038
1995	26.015
1996	25.256
1997	24.66
1998	24.919
1999	24.252
2000	23.976
2001	23.518
2002	23.836
2003	23.013
2004	21.525
2005	21.783
2006	21.567
2007	22.347
2008	22.548
2009	23.411
2010	22.919
2011	23.163
2012	24.997
2013	25.374
2014	26.04
2015	25.843
2016	23.926
2017	24.119
2018	24.105
2019	24.114
2020	24.088
2021	24.039
2022	23.948