Year	Percent
1990	64.347
1991	64.661
1992	64.69
1993	64.381
1994	64.473
1995	64.672
1996	64.369
1997	64.481
1998	64.953
1999	65.143
2000	65.341
2001	65.789
2002	66.199
2003	66.404
2004	66.669
2005	67.001
2006	67.247
2007	67.571
2008	67.735
2009	67.65
2010	67.742
2011	67.597
2012	67.44
2013	67.248
2014	67.076
2015	66.93
2016	66.842
2017	67.006
2018	67.179
2019	67.304
2020	67.358
2021	67.383
2022	67.344
2023	67.258
2024	67.162
2025	67.085
2026	67.06
2027	67.062
2028	67.079
2029	67.118
2030	67.169