Year	Percent
1990	89.143
1991	89.145
1992	89.048
1993	87.236
1994	85.579
1995	85.07
1996	84.566
1997	83.169
1998	82.341
1999	85.049
2000	85.25
2001	84.412
2002	85.148
2003	85.008
2004	85.492
2005	85.807
2006	86.483
2007	86.62
2008	85.992
2009	85.858
2010	86.001
2011	86.266
2012	86.593
2013	85.683
2014	85.998
2015	85.844
2016	86.667
2017	86.882
2018	87.123
2019	87.376
2020	87.631
2021	87.891
2022	88.159
2023	88.428
2024	88.693
2025	88.946
2026	89.185
2027	89.403
2028	89.599
2029	89.771
2030	89.92