Year	Percent
1990	87.92
1991	87.879
1992	87.845
1993	87.804
1994	87.822
1995	87.83
1996	87.822
1997	87.825
1998	87.855
1999	87.846
2000	87.873
2001	87.897
2002	87.934
2003	87.947
2004	87.964
2005	87.975
2006	87.977
2007	87.988
2008	87.973
2009	87.925
2010	87.927
2011	87.938
2012	87.948
2013	87.955
2014	87.964
2015	87.972
2016	87.959
2017	87.938
2018	87.914
2019	87.893
2020	87.883
2021	87.884
2022	87.896
2023	87.917
2024	87.944
2025	87.975
2026	88.01
2027	88.05
2028	88.092
2029	88.132
2030	88.167