Year	Percent
1990	72.316
1991	72.204
1992	72.642
1993	73.054
1994	73.372
1995	73.558
1996	73.69
1997	73.726
1998	73.722
1999	73.752
2000	73.852
2001	73.949
2002	73.859
2003	73.099
2004	74.907
2005	75.986
2006	75.812
2007	75.791
2008	76.973
2009	77.87
2010	77.494
2011	75.868
2012	76.66
2013	76.85
2014	81.565
2015	82.073
2016	78.761
2017	79.138
2018	79.517
2019	79.882
2020	80.224
2021	80.548
2022	80.849
2023	81.137
2024	81.428
2025	81.732
2026	82.052
2027	82.388
2028	82.737
2029	83.087
2030	83.428