Year	Percent
1990	61.082
1991	61.15
1992	61.23
1993	61.312
1994	61.333
1995	61.317
1996	61.305
1997	60.918
1998	60.51
1999	60.09
2000	61.009
2001	61.912
2002	62.79
2003	63.065
2004	60.949
2005	63.635
2006	62.892
2007	64.995
2008	63.905
2009	63.864
2010	64.969
2011	65.87
2012	64.429
2013	66.018
2014	66.422
2015	65.25
2016	64.801
2017	65.083
2018	65.359
2019	65.626
2020	65.883
2021	66.13
2022	66.364
2023	66.583
2024	66.79
2025	66.986
2026	67.175
2027	67.359
2028	67.543
2029	67.731
2030	67.928