Year	Percent
1991	55.283
1992	55.847
1993	50.968
1994	50.393
1995	61.011
1996	60.62
1997	58.245
1998	65.156
1999	65.649
2000	69.555
2001	75.409
2002	64.12
2003	62.529
2004	60.892
2005	67.679
2006	70.363
2007	74.072
2008	69.846
2009	56.403
2010	57.876
2011	58.162
2012	62.061
2013	64.195
2014	67.353
2015	69.891
2016	76.909
2017	75.38
2018	75.047
2019	74.662
2020	74.287
2021	73.941
2022	73.628