Year	Percent
1990	78.826
1991	78.719
1992	78.348
1993	78.475
1994	78.565
1995	78.53
1996	78.595
1997	78.492
1998	77.61
1999	76.68
2000	75.7
2001	74.674
2002	73.592
2003	72.461
2004	71.296
2005	73.57
2006	75.613
2007	77.427
2008	79.027
2009	79.054
2010	78.73
2011	78.327
2012	77.259
2013	76.968
2014	77.416
2015	77.547
2016	76.89
2017	77.106
2018	77.323
2019	77.506
2020	77.639
2021	77.736
2022	77.798
2023	77.83
2024	77.842
2025	77.841
2026	77.831
2027	77.808
2028	77.787
2029	77.788
2030	77.821