Year	Percent
1990	75.445
1991	75.878
1992	75.323
1993	75.682
1994	75.409
1995	75.715
1996	76.002
1997	76.888
1998	77.554
1999	78.188
2000	78.486
2001	79.082
2002	80.363
2003	81.117
2004	81.507
2005	81.097
2006	81.237
2007	82.106
2008	81.914
2009	82.13
2010	82.338
2011	82.157
2012	82.468
2013	82.705
2014	81.9
2015	81.993
2016	82.172
2017	82.37
2018	82.567
2019	82.761
2020	82.949
2021	83.136
2022	83.321
2023	83.508
2024	83.698
2025	83.89
2026	84.087
2027	84.286
2028	84.489
2029	84.693
2030	84.897