Year	Percent
1990	82.953
1991	83.441
1992	84.153
1993	84.55
1994	84.543
1995	84.652
1996	85.191
1997	85.511
1998	85.469
1999	85.365
2000	85.343
2001	85.137
2002	84.917
2003	84.769
2004	84.39
2005	84.399
2006	84.558
2007	85.071
2008	85.137
2009	84.853
2010	84.885
2011	84.667
2012	84.521
2013	84.78
2014	85.012
2015	85.161
2016	85.644
2017	85.595
2018	85.548
2019	85.491
2020	85.416
2021	85.318
2022	85.204
2023	85.078
2024	84.947
2025	84.815
2026	84.674
2027	84.531
2028	84.387
2029	84.241
2030	84.094