Year	Percent
1990	90.973
1991	90.956
1992	90.936
1993	90.878
1994	90.799
1995	90.74
1996	90.698
1997	90.794
1998	90.773
1999	90.834
2000	90.871
2001	90.93
2002	90.996
2003	91.051
2004	91.021
2005	91.011
2006	90.966
2007	90.898
2008	90.641
2009	90.357
2010	90.167
2011	90.232
2012	90.335
2013	90.488
2014	90.593
2015	90.674
2016	90.72
2017	90.716
2018	90.722
2019	90.737
2020	90.759
2021	90.786
2022	90.819
2023	90.852
2024	90.877
2025	90.886
2026	90.882
2027	90.858
2028	90.815
2029	90.754
2030	90.675