Year	Percent
1990	88.622
1991	88.148
1992	87.864
1993	88.442
1994	88.698
1995	88.694
1996	87.934
1997	87.476
1998	87.16
1999	86.668
2000	86.693
2001	86.175
2002	85.798
2003	85.869
2004	85.868
2005	85.355
2006	85.673
2007	86.459
2008	86.674
2009	86.095
2010	86.573
2011	86.626
2012	86.907
2013	86.541
2014	86.82
2015	87.291
2016	86.885
2017	86.922
2018	86.956
2019	86.982
2020	86.999
2021	87.007
2022	87.006
2023	86.999
2024	86.993
2025	86.989
2026	86.988
2027	86.99
2028	86.995
2029	87
2030	87.006