Year	Percent
1990	75.263
1991	75.837
1992	77.742
1993	79.388
1994	80.37
1995	80.671
1996	80.262
1997	76.956
1998	75.899
1999	75.113
2000	73.822
2001	73.929
2002	73.879
2003	75.892
2004	75.832
2005	75.723
2006	75.541
2007	75.302
2008	75.189
2009	75.132
2010	74.953
2011	74.651
2012	74.315
2013	73.892
2014	73.85
2015	73.824
2016	73.877
2017	73.903
2018	73.925
2019	73.933
2020	73.921
2021	73.886
2022	73.836
2023	73.776
2024	73.714
2025	73.655
2026	73.594
2027	73.536
2028	73.483
2029	73.439
2030	73.403