Year	Percent
1991	62.135
1992	61.953
1993	61.935
1994	61.917
1995	61.898
1996	61.861
1997	61.82
1998	61.773
1999	61.73
2000	61.713
2001	61.672
2002	61.685
2003	62.098
2004	62.793
2005	63.478
2006	63.22
2007	62.944
2008	62.661
2009	62.402
2010	62.705
2011	63.024
2012	63.459
2013	64.672
2014	64.722
2015	64.764
2016	64.692
2017	64.706
2018	64.726
2019	64.756
2020	64.798
2021	64.844
2022	64.899