Year	Percent
1991	52.63
1992	52.969
1993	53.329
1994	53.45
1995	53.208
1996	52.988
1997	51.948
1998	51.743
1999	59.065
2000	57.594
2001	51.962
2002	54.51
2003	57.263
2004	60.773
2005	59.8
2006	61.863
2007	59.896
2008	57.066
2009	52.789
2010	50.176
2011	47.191
2012	47.581
2013	47.077
2014	45.698
2015	44.734
2016	27.636
2017	28.16
2018	28.049
2019	28.137
2020	28.165
2021	28.386
2022	28.506