Year	Percent
1990	90.104
1991	89.943
1992	89.844
1993	87.783
1994	86.793
1995	86.4
1996	85.772
1997	84.765
1998	83.279
1999	84.522
2000	84.406
2001	84.344
2002	84.342
2003	85.005
2004	85.144
2005	85.57
2006	86.595
2007	86.973
2008	87.178
2009	87.014
2010	87.27
2011	88.207
2012	89.386
2013	89.506
2014	91.243
2015	92.001
2016	92.394
2017	92.373
2018	92.341
2019	92.307
2020	92.28
2021	92.262
2022	92.252
2023	92.251
2024	92.255
2025	92.263
2026	92.276
2027	92.292
2028	92.311
2029	92.338
2030	92.373