Year	Percent
1990	82.256
1991	82.102
1992	83.521
1993	84.824
1994	84.779
1995	85.372
1996	85.046
1997	84.704
1998	84.795
1999	84.841
2000	84.737
2001	84.63
2002	84.512
2003	84.594
2004	85.213
2005	84.881
2006	84.504
2007	85.057
2008	86.98
2009	87.275
2010	86.841
2011	85.372
2012	86.071
2013	86.071
2014	85.493
2015	85.486
2016	85.441
2017	85.534
2018	85.632
2019	85.726
2020	85.813
2021	85.893
2022	85.967
2023	86.038
2024	86.104
2025	86.167
2026	86.225
2027	86.279
2028	86.334
2029	86.399
2030	86.479