Year	Percent
1991	57.386
1992	60.027
1993	56.681
1994	56.727
1995	64.176
1996	58.821
1997	58.914
1998	59.178
1999	59.179
2000	59.085
2001	58.734
2002	65.274
2003	64.532
2004	62.619
2005	65.614
2006	64
2007	65.838
2008	63.563
2009	67.002
2010	64.63
2011	64.076
2012	64.734
2013	64.198
2014	64.105
2015	64.178
2016	64.311
2017	64.35
2018	64.447
2019	64.551
2020	64.667
2021	64.785
2022	64.891