Year	Percent
1991	21.178
1992	22.803
1993	24.376
1994	25.684
1995	26.581
1996	25.325
1997	25.221
1998	24.33
1999	25.442
2000	24.171
2001	24.612
2002	24.876
2003	26.431
2004	25.07
2005	23.689
2006	25.798
2007	25.592
2008	25.537
2009	22.37
2010	23.443
2011	22.942
2012	22.844
2013	22.451
2014	23.048
2015	24.123
2016	24.02
2017	24.063
2018	24.09
2019	24.163
2020	24.206
2021	24.268
2022	24.317