Year	Percent
1990	96.261
1991	96.223
1992	96.217
1993	96.029
1994	95.837
1995	95.64
1996	95.41
1997	95.159
1998	94.874
1999	94.545
2000	95.553
2001	95.144
2002	94.976
2003	94.605
2004	94.21
2005	93.803
2006	93.357
2007	94.045
2008	94.315
2009	94.459
2010	94.393
2011	94.307
2012	95.533
2013	96.534
2014	96.491
2015	96.399
2016	96.396
2017	96.421
2018	96.452
2019	96.487
2020	96.523
2021	96.514
2022	96.504
2023	96.501
2024	96.508
2025	96.526
2026	96.537
2027	96.549
2028	96.567
2029	96.595
2030	96.635