Year	Percent
1990	84.772
1991	84.598
1992	84.718
1993	84.688
1994	84.633
1995	84.627
1996	84.549
1997	84.492
1998	84.365
1999	84.282
2000	84.343
2001	84.119
2002	84.161
2003	84.073
2004	84.153
2005	85.686
2006	87.078
2007	88.337
2008	89.476
2009	90.506
2010	91.436
2011	92.812
2012	93.959
2013	94.911
2014	95.701
2015	95.636
2016	95.556
2017	95.646
2018	95.732
2019	95.816
2020	95.897
2021	95.977
2022	96.055
2023	96.132
2024	96.206
2025	96.277
2026	96.347
2027	96.415
2028	96.484
2029	96.554
2030	96.625