Year	Percent
1990	78.848
1991	78.778
1992	76.014
1993	75.638
1994	75.933
1995	75.596
1996	75.697
1997	75.773
1998	77.235
1999	78.243
2000	78.977
2001	78.909
2002	78.333
2003	78.499
2004	79.261
2005	80.735
2006	81.565
2007	81.564
2008	80.865
2009	78.837
2010	77.405
2011	76.921
2012	76.926
2013	77.405
2014	77.578
2015	77.871
2016	77.84
2017	77.526
2018	77.186
2019	76.819
2020	76.429
2021	76.006
2022	75.574
2023	75.159
2024	74.79
2025	74.485
2026	74.218
2027	74.018
2028	73.874
2029	73.768
2030	73.688