Year	Percent
1990	93.291
1991	93.562
1992	91.343
1993	90.995
1994	91.5
1995	90.919
1996	91.772
1997	90.718
1998	91.367
1999	91.626
2000	91.976
2001	91.782
2002	91.289
2003	90.973
2004	91.79
2005	92.122
2006	92.113
2007	91.752
2008	91.584
2009	90.34
2010	89.568
2011	89.049
2012	89.278
2013	89.224
2014	89.602
2015	89.597
2016	89.315
2017	89.265
2018	89.209
2019	89.143
2020	89.063
2021	88.971
2022	88.867
2023	88.755
2024	88.644
2025	88.537
2026	88.434
2027	88.335
2028	88.24
2029	88.149
2030	88.063