Year	Percent
1990	80.833
1991	81.008
1992	81.101
1993	81.104
1994	81.059
1995	81.119
1996	81.06
1997	81.114
1998	81.068
1999	80.895
2000	80.888
2001	80.844
2002	80.536
2003	80.214
2004	80.486
2005	80.573
2006	80.651
2007	80.007
2008	79.727
2009	79.424
2010	79.315
2011	78.944
2012	78.223
2013	78.164
2014	78.067
2015	77.923
2016	77.576
2017	77.441
2018	77.285
2019	77.112
2020	76.923
2021	76.732
2022	76.531
2023	76.321
2024	76.104
2025	75.882
2026	75.666
2027	75.451
2028	75.238
2029	75.03
2030	74.829