Year	Percent
1991	66.689
1992	65.328
1993	64.735
1994	68.19
1995	69.432
1996	62.086
1997	67.256
1998	67.259
1999	61.584
2000	63.714
2001	63.83
2002	64.378
2003	66.338
2004	68.082
2005	68.273
2006	67.579
2007	68.984
2008	69.391
2009	69.613
2010	66.254
2011	63.054
2012	66.315
2013	64.49
2014	63.956
2015	61.065
2016	64.284
2017	63.611
2018	63.669
2019	63.586
2020	63.571
2021	63.416
2022	63.175