Year	Percent
1990	77.615
1991	77.736
1992	77.848
1993	77.947
1994	78.056
1995	78.162
1996	78.252
1997	78.366
1998	78.46
1999	78.536
2000	78.597
2001	78.645
2002	78.667
2003	78.666
2004	78.658
2005	78.657
2006	78.695
2007	78.744
2008	78.836
2009	78.998
2010	79.252
2011	79.601
2012	80.036
2013	80.505
2014	80.928
2015	81.244
2016	81.466
2017	81.578
2018	81.619
2019	81.64
2020	81.668
2021	81.697
2022	81.734
2023	81.746
2024	81.68
2025	81.51
2026	81.252
2027	80.906
2028	80.537
2029	80.233
2030	80.046