Year	Percent
1990	92.665
1991	92.649
1992	92.623
1993	91.9
1994	91.093
1995	90.198
1996	89.217
1997	88.132
1998	86.945
1999	85.665
2000	84.294
2001	84.904
2002	83.707
2003	82.33
2004	83.538
2005	83.196
2006	84.975
2007	87.293
2008	88.69
2009	87.787
2010	86.09
2011	84.481
2012	84.823
2013	85.716
2014	86.237
2015	86.371
2016	85.655
2017	85.824
2018	85.999
2019	86.173
2020	86.342
2021	86.507
2022	86.668
2023	86.824
2024	86.973
2025	87.114
2026	87.247
2027	87.369
2028	87.483
2029	87.592
2030	87.7