Year	Percent
1990	66.528
1991	66.496
1992	66.499
1993	66.492
1994	66.494
1995	66.545
1996	66.629
1997	66.874
1998	66.441
1999	65.195
2000	66.054
2001	65.615
2002	64.057
2003	66.297
2004	67.616
2005	67.857
2006	69.634
2007	68.931
2008	70.308
2009	70.628
2010	71.168
2011	71.613
2012	71.579
2013	71.962
2014	71.492
2015	73.173
2016	73.449
2017	73.654
2018	73.79
2019	73.872
2020	73.914
2021	73.919
2022	73.875
2023	73.82
2024	73.811
2025	73.884
2026	74.047
2027	74.313
2028	74.642
2029	74.963
2030	75.228