Year	Percent
1990	82.427
1991	81.849
1992	81.301
1993	80.939
1994	80.667
1995	80.251
1996	80.8
1997	81.359
1998	81.879
1999	82.394
2000	82.866
2001	83.612
2002	84.264
2003	84.806
2004	85.309
2005	85.743
2006	85.714
2007	85.668
2008	85.49
2009	85.394
2010	85.266
2011	85.215
2012	85.157
2013	85.078
2014	85.043
2015	85.046
2016	85.241
2017	85.329
2018	85.411
2019	85.489
2020	85.56
2021	85.628
2022	85.692
2023	85.751
2024	85.803
2025	85.848
2026	85.889
2027	85.926
2028	85.96
2029	85.994
2030	86.03