Year	Percent
1990	78.087
1991	77.999
1992	78.06
1993	77.762
1994	77.783
1995	77.759
1996	77.913
1997	78.051
1998	78.18
1999	78.057
2000	77.895
2001	77.667
2002	77.363
2003	76.929
2004	76.887
2005	76.772
2006	76.68
2007	76.668
2008	76.755
2009	76.993
2010	77.087
2011	77.064
2012	77.137
2013	77.152
2014	77.168
2015	77.194
2016	77.286
2017	77.426
2018	77.564
2019	77.667
2020	77.717
2021	77.767
2022	77.768
2023	77.722
2024	77.64
2025	77.527
2026	77.438
2027	77.33
2028	77.186
2029	76.983
2030	76.714