Year	Percent
1990	95.019
1991	94.721
1992	94.026
1993	93.308
1994	92.92
1995	92.678
1996	91.947
1997	91.567
1998	91.449
1999	91.67
2000	91.917
2001	91.291
2002	91.188
2003	91.388
2004	90.951
2005	91.1
2006	91.669
2007	91.597
2008	91.643
2009	91.649
2010	91.422
2011	91.654
2012	91.991
2013	92.016
2014	92.215
2015	91.92
2016	92.172
2017	92.233
2018	92.296
2019	92.36
2020	92.425
2021	92.49
2022	92.556
2023	92.621
2024	92.685
2025	92.745
2026	92.803
2027	92.859
2028	92.913
2029	92.965
2030	93.014