Year	Percent
1990	80.769
1991	79.372
1992	77.908
1993	77.115
1994	76.361
1995	74.668
1996	73.589
1997	75.41
1998	75.734
1999	76.224
2000	76.757
2001	77.035
2002	77.132
2003	76.977
2004	76.451
2005	76.299
2006	76.898
2007	77.008
2008	77.72
2009	76.003
2010	76.085
2011	76.747
2012	76.674
2013	76.476
2014	76.479
2015	76.845
2016	77.406
2017	77.526
2018	77.622
2019	77.696
2020	77.747
2021	77.747
2022	77.715
2023	77.673
2024	77.653
2025	77.673
2026	77.7
2027	77.763
2028	77.853
2029	77.956
2030	78.058