Year	Percent
1990	63.855
1991	63.859
1992	63.901
1993	63.83
1994	63.845
1995	63.761
1996	63.741
1997	64.224
1998	64.194
1999	62.065
2000	61.642
2001	63.087
2002	64.903
2003	64.773
2004	64.175
2005	64.781
2006	66.418
2007	67.768
2008	70.417
2009	70.785
2010	70.977
2011	70.263
2012	72.069
2013	71.666
2014	71.456
2015	72.755
2016	74.111
2017	74.375
2018	74.512
2019	74.56
2020	74.547
2021	74.478
2022	74.338
2023	74.165
2024	74.025
2025	73.969
2026	74
2027	74.16
2028	74.412
2029	74.683
2030	74.926