Year	Percent
1990	85.376
1991	85.179
1992	85.118
1993	85.147
1994	85.151
1995	85.05
1996	84.925
1997	84.79
1998	84.685
1999	84.619
2000	84.572
2001	84.594
2002	84.044
2003	83.416
2004	82.657
2005	81.887
2006	81.235
2007	80.806
2008	79.786
2009	79.465
2010	79.445
2011	79.028
2012	79.355
2013	79.701
2014	80.037
2015	80.318
2016	80.461
2017	80.275
2018	80.077
2019	79.907
2020	79.79
2021	79.72
2022	79.691
2023	79.704
2024	79.755
2025	79.841
2026	79.965
2027	80.124
2028	80.295
2029	80.446
2030	80.554