Year	Percent
1990	86.367
1991	86.291
1992	86.23
1993	86.237
1994	86.136
1995	86.088
1996	86.055
1997	86.472
1998	86.85
1999	87.201
2000	86.666
2001	90.335
2002	87.908
2003	84.983
2004	81.497
2005	83.016
2006	84.41
2007	85.681
2008	86.845
2009	87.914
2010	88.893
2011	88.732
2012	88.586
2013	88.477
2014	88.428
2015	88.43
2016	88.469
2017	88.783
2018	89.112
2019	89.422
2020	89.694
2021	89.928
2022	90.12
2023	90.288
2024	90.465
2025	90.671
2026	90.901
2027	91.156
2028	91.424
2029	91.684
2030	91.926