Year	Percent
1990	97.052
1991	97.035
1992	97.014
1993	97.003
1994	96.967
1995	96.942
1996	96.914
1997	97.045
1998	97.152
1999	97.226
2000	97.112
2001	97.957
2002	97.324
2003	96.403
2004	95.055
2005	95.617
2006	96.093
2007	96.484
2008	96.807
2009	97.091
2010	97.36
2011	97.302
2012	97.264
2013	97.233
2014	97.197
2015	97.14
2016	97.061
2017	97.094
2018	97.12
2019	97.15
2020	97.191
2021	97.24
2022	97.293
2023	97.351
2024	97.419
2025	97.499
2026	97.594
2027	97.709
2028	97.823
2029	97.904
2030	97.93