Year	Percent
1990	96.886
1991	96.898
1992	96.915
1993	96.932
1994	96.943
1995	96.963
1996	96.984
1997	97.243
1998	96.942
1999	96.808
2000	96.654
2001	96.478
2002	96.274
2003	96.368
2004	96.889
2005	97.291
2006	97.25
2007	97.014
2008	96.74
2009	96.422
2010	95.49
2011	95.553
2012	95.072
2013	95.565
2014	96.296
2015	96.884
2016	96.722
2017	96.634
2018	96.548
2019	96.463
2020	96.379
2021	96.295
2022	96.213
2023	96.132
2024	96.052
2025	95.974
2026	95.897
2027	95.821
2028	95.747
2029	95.672
2030	95.595