Year	Percent
1990	64.911
1991	64.971
1992	65.075
1993	65.197
1994	65.335
1995	65.458
1996	65.641
1997	65.845
1998	66.027
1999	68.233
2000	67.625
2001	66.404
2002	65.724
2003	69.438
2004	65.685
2005	65.152
2006	64.621
2007	64.876
2008	65.487
2009	67.664
2010	68.728
2011	69.516
2012	70.323
2013	70.489
2014	71.665
2015	72.526
2016	73.853
2017	74.149
2018	74.437
2019	74.689
2020	74.885
2021	75.021
2022	75.088
2023	75.098
2024	75.077
2025	75.046
2026	75.009
2027	74.958
2028	74.894
2029	74.814
2030	74.724