Year	Percent
1991	63.449
1992	62.781
1993	64.415
1994	64.426
1995	64.33
1996	64.738
1997	62.677
1998	62.639
1999	63.477
2000	63.404
2001	64.152
2002	64.555
2003	65.056
2004	66.039
2005	63.393
2006	60.437
2007	58.44
2008	55.813
2009	51.732
2010	51.897
2011	66.14
2012	68.4
2013	66.781
2014	65.214
2015	67.114
2016	67.015
2017	66.997
2018	67.11
2019	67.239
2020	67.345
2021	67.434
2022	67.541