Year	Percent
1990	84.466
1991	85.032
1992	85.586
1993	85.853
1994	85.898
1995	85.765
1996	85.777
1997	85.708
1998	85.648
1999	85.584
2000	85.587
2001	85.49
2002	85.301
2003	84.997
2004	84.507
2005	84.149
2006	83.71
2007	83.16
2008	82.661
2009	84.223
2010	83.872
2011	84.466
2012	82.703
2013	84.102
2014	85.019
2015	85.227
2016	83.037
2017	83.082
2018	83.134
2019	83.18
2020	83.215
2021	83.243
2022	83.261
2023	83.27
2024	83.274
2025	83.277
2026	83.28
2027	83.28
2028	83.279
2029	83.278
2030	83.281