Year	Percent
1990	90.793
1991	90.812
1992	90.591
1993	90.336
1994	90.083
1995	89.798
1996	89.499
1997	89.215
1998	88.917
1999	88.616
2000	88.337
2001	88.047
2002	87.763
2003	87.457
2004	87.154
2005	86.821
2006	86.497
2007	85.418
2008	84.262
2009	83.026
2010	81.706
2011	80.305
2012	78.814
2013	77.225
2014	75.535
2015	75.414
2016	75.285
2017	75.157
2018	75.023
2019	74.883
2020	74.736
2021	74.593
2022	74.446
2023	74.299
2024	74.157
2025	74.023
2026	73.902
2027	73.789
2028	73.682
2029	73.579
2030	73.479