Year	Percent
1990	86.001
1991	84.97
1992	83.12
1993	81.218
1994	80.377
1995	81.221
1996	80.887
1997	80.663
1998	80.749
1999	80.479
2000	79.632
2001	80.174
2002	79.595
2003	79.656
2004	79.703
2005	81.688
2006	81.184
2007	81.494
2008	81.712
2009	81.286
2010	81.712
2011	82.18
2012	82.367
2013	83.235
2014	83.659
2015	83.675
2016	84.097
2017	84.338
2018	84.508
2019	84.643
2020	84.768
2021	84.846
2022	84.894
2023	84.93
2024	84.979
2025	85.056
2026	85.13
2027	85.237
2028	85.369
2029	85.51
2030	85.646