Year	Percent
1990	78.575
1991	78.404
1992	78.217
1993	77.992
1994	77.77
1995	77.521
1996	77.371
1997	77.218
1998	77.037
1999	76.831
2000	76.607
2001	76.839
2002	77.063
2003	77.277
2004	77.485
2005	77.689
2006	77.898
2007	78.1
2008	78.292
2009	78.475
2010	78.651
2011	78.875
2012	79.1
2013	79.328
2014	79.172
2015	79.031
2016	78.961
2017	79.173
2018	79.385
2019	79.585
2020	79.765
2021	79.927
2022	80.078
2023	80.216
2024	80.342
2025	80.456
2026	80.556
2027	80.647
2028	80.735
2029	80.832
2030	80.941