Year	Percent
1990	62.026
1991	61.873
1992	61.735
1993	61.537
1994	61.765
1995	61.917
1996	61.965
1997	62.219
1998	62.464
1999	62.676
2000	62.833
2001	62.923
2002	62.969
2003	63.207
2004	63.481
2005	63.788
2006	64.086
2007	64.391
2008	64.697
2009	64.988
2010	65.26
2011	65.563
2012	65.856
2013	65.864
2014	65.899
2015	65.965
2016	65.95
2017	66.072
2018	66.204
2019	66.35
2020	66.514
2021	66.689
2022	66.879
2023	67.078
2024	67.275
2025	67.461
2026	67.658
2027	67.847
2028	68.026
2029	68.196
2030	68.357