Year	Percent
1991	48.281
1992	66.747
1993	76.332
1994	76.86
1995	75.845
1996	77.942
1997	66.027
1998	77.103
1999	78.532
2000	74.878
2001	75.337
2002	72.669
2003	72.731
2004	72.427
2005	71.56
2006	71.105
2007	70.502
2008	66.303
2009	66.289
2010	62.505
2011	65.04
2012	69.958
2013	63.112
2014	59.165
2015	57.438
2016	58.007
2017	58.253
2018	58.178
2019	58.129
2020	58.105
2021	58.032
2022	57.975