Year	Percent
1990	85.451
1991	85.531
1992	85.653
1993	85.77
1994	85.874
1995	85.971
1996	85.486
1997	84.854
1998	84.109
1999	83.608
2000	84.495
2001	81.712
2002	80.158
2003	81.984
2004	82.584
2005	83.286
2006	85.531
2007	83.622
2008	83.69
2009	83.771
2010	84.773
2011	84.671
2012	83.452
2013	82.841
2014	81.912
2015	82.986
2016	81.794
2017	81.951
2018	82.131
2019	82.331
2020	82.552
2021	82.793
2022	83.061
2023	83.347
2024	83.639
2025	83.927
2026	84.207
2027	84.486
2028	84.757
2029	85.007
2030	85.227