Year	Percent
1990	86.923
1991	86.855
1992	86.844
1993	85.677
1994	85.855
1995	85.606
1996	85.73
1997	85.839
1998	85.497
1999	85.872
2000	86.216
2001	86.13
2002	86.023
2003	86.084
2004	86.144
2005	86.767
2006	87.393
2007	86.609
2008	85.968
2009	86.083
2010	83.166
2011	82.925
2012	83.38
2013	83.82
2014	83.309
2015	84.11
2016	85.874
2017	85.836
2018	85.793
2019	85.72
2020	85.603
2021	85.452
2022	85.265
2023	85.049
2024	84.819
2025	84.583
2026	84.344
2027	84.098
2028	83.855
2029	83.627
2030	83.423