Year	Percent
1990	77.439
1991	77.474
1992	77.487
1993	77.451
1994	77.326
1995	77.479
1996	77.706
1997	77.8
1998	77.744
1999	77.651
2000	75.927
2001	77.834
2002	75.901
2003	77.216
2004	75.62
2005	76.192
2006	76.793
2007	77.447
2008	78.126
2009	78.799
2010	79.333
2011	81.752
2012	83.236
2013	82.258
2014	82.689
2015	83.353
2016	82.833
2017	83.17
2018	83.466
2019	83.686
2020	83.809
2021	83.86
2022	83.811
2023	83.686
2024	83.528
2025	83.374
2026	83.249
2027	83.131
2028	83.04
2029	83.002
2030	83.035