Year	Percent
1990	93.108
1991	92.453
1992	91.457
1993	91.434
1994	91.242
1995	90.925
1996	90.812
1997	90.949
1998	91.125
1999	91.078
2000	91.064
2001	91.092
2002	91.463
2003	91.643
2004	91.573
2005	91.485
2006	91.103
2007	91.113
2008	91.504
2009	90.814
2010	90.617
2011	90.662
2012	90.853
2013	90.694
2014	90.516
2015	90.907
2016	90.893
2017	90.873
2018	90.854
2019	90.836
2020	90.819
2021	90.804
2022	90.789
2023	90.774
2024	90.757
2025	90.737
2026	90.715
2027	90.689
2028	90.661
2029	90.628
2030	90.59