Year	Percent
1990	77.605
1991	78.073
1992	78.202
1993	77.389
1994	73.33
1995	73.304
1996	73.357
1997	73.893
1998	74.773
1999	75.52
2000	75.409
2001	74.651
2002	75.443
2003	74.383
2004	75.762
2005	75.783
2006	76.846
2007	76.57
2008	77.113
2009	76.831
2010	75.999
2011	75.925
2012	75.525
2013	75.433
2014	74.911
2015	75.268
2016	77.278
2017	77.302
2018	77.293
2019	77.276
2020	77.265
2021	77.247
2022	77.224
2023	77.201
2024	77.188
2025	77.192
2026	77.205
2027	77.233
2028	77.278
2029	77.341
2030	77.42