Year	Percent
1990	86.45
1991	86.86
1992	87.5
1993	86.457
1994	86.623
1995	89.67
1996	88.502
1997	87.951
1998	89.29
1999	89.98
2000	90.896
2001	91.861
2002	90.14
2003	89.893
2004	89.452
2005	88.787
2006	90.011
2007	90.663
2008	89.719
2009	87.044
2010	87.043
2011	86.762
2012	86.605
2013	87.794
2014	89.552
2015	90.409
2016	91.947
2017	91.729
2018	91.501
2019	91.258
2020	91.003
2021	90.735
2022	90.457
2023	90.176
2024	89.901
2025	89.636
2026	89.376
2027	89.124
2028	88.878
2029	88.633
2030	88.386