Year	Percent
1990	83.361
1991	82.916
1992	84.412
1993	84.858
1994	86.275
1995	86.672
1996	86.557
1997	83.765
1998	83.574
1999	86.311
2000	89.349
2001	87.505
2002	88.15
2003	87.037
2004	85.75
2005	84.263
2006	84.732
2007	84.164
2008	83.394
2009	83.872
2010	84.185
2011	84.571
2012	85.155
2013	85.431
2014	86.876
2015	87.826
2016	88.819
2017	88.663
2018	88.51
2019	88.36
2020	88.21
2021	88.06
2022	87.906
2023	87.751
2024	87.603
2025	87.467
2026	87.345
2027	87.239
2028	87.142
2029	87.04
2030	86.925