Year	Percent
1990	78.134
1991	78.275
1992	78.484
1993	78.555
1994	78.873
1995	79.169
1996	79.457
1997	79.722
1998	79.971
1999	80.213
2000	80.455
2001	80.711
2002	80.971
2003	81.227
2004	81.467
2005	81.686
2006	81.891
2007	82.075
2008	82.241
2009	82.394
2010	82.472
2011	82.977
2012	83.58
2013	83.028
2014	83.035
2015	82.844
2016	82.559
2017	82.589
2018	82.595
2019	82.592
2020	82.587
2021	82.596
2022	82.607
2023	82.613
2024	82.607
2025	82.584
2026	82.564
2027	82.535
2028	82.493
2029	82.441
2030	82.378