Year	Percent
1990	97.47
1991	97.463
1992	97.506
1993	97.119
1994	97.388
1995	97.319
1996	97.399
1997	97.459
1998	97.08
1999	96.891
2000	96.666
2001	96.669
2002	96.668
2003	96.587
2004	96.474
2005	96.837
2006	97.149
2007	97.329
2008	97.153
2009	97.458
2010	95.397
2011	95.879
2012	96.006
2013	96.119
2014	96.035
2015	96.781
2016	97.62
2017	97.523
2018	97.429
2019	97.337
2020	97.245
2021	97.154
2022	97.063
2023	96.972
2024	96.883
2025	96.795
2026	96.708
2027	96.622
2028	96.536
2029	96.446
2030	96.351