Year	Percent
1990	96.056
1991	96.11
1992	96.104
1993	96.137
1994	96.174
1995	96.208
1996	96.236
1997	96.271
1998	96.317
1999	96.308
2000	96.236
2001	96.393
2002	96.533
2003	96.659
2004	96.775
2005	96.883
2006	96.983
2007	96.404
2008	96.059
2009	96.915
2010	96.712
2011	96.352
2012	95.994
2013	95.964
2014	95.692
2015	95.375
2016	95.397
2017	95.406
2018	95.415
2019	95.423
2020	95.43
2021	95.436
2022	95.441
2023	95.446
2024	95.454
2025	95.465
2026	95.478
2027	95.493
2028	95.511
2029	95.53
2030	95.55