Year	Percent
1990	84.391
1991	84.322
1992	84.304
1993	83.006
1994	83.375
1995	83.204
1996	83.343
1997	83.473
1998	83.154
1999	83.454
2000	83.727
2001	83.502
2002	83.264
2003	83.377
2004	83.489
2005	84.056
2006	84.612
2007	83.859
2008	83.163
2009	83.174
2010	80.051
2011	79.747
2012	80.214
2013	80.672
2014	80.128
2015	81.161
2016	82.754
2017	82.699
2018	82.637
2019	82.541
2020	82.394
2021	82.195
2022	81.957
2023	81.688
2024	81.402
2025	81.108
2026	80.798
2027	80.482
2028	80.17
2029	79.873
2030	79.598