Year	Percent
1991	24.618
1992	25.219
1993	25.887
1994	23.993
1995	24.808
1996	24.597
1997	28.292
1998	29.243
1999	27.738
2000	24.852
2001	23.738
2002	25.533
2003	24.094
2004	21.331
2005	26.2
2006	28.896
2007	32.637
2008	32.171
2009	25.748
2010	24.628
2011	23.541
2012	25.554
2013	27.04
2014	28.38
2015	32.499
2016	32.978
2017	30.767
2018	29.038
2019	27.218
2020	25.748
2021	24.791
2022	24.267