Year	Percent
1990	90.784
1991	90.345
1992	89.845
1993	89.283
1994	88.665
1995	87.993
1996	87.262
1997	86.465
1998	85.592
1999	84.979
2000	84.332
2001	83.835
2002	83.35
2003	82.886
2004	82.452
2005	82.053
2006	81.646
2007	81.266
2008	80.917
2009	80.61
2010	80.35
2011	80.112
2012	79.917
2013	79.748
2014	79.574
2015	79.869
2016	80.125
2017	80.214
2018	80.27
2019	80.278
2020	80.233
2021	80.126
2022	79.973
2023	79.788
2024	79.596
2025	79.408
2026	79.218
2027	79.036
2028	78.864
2029	78.707
2030	78.567