Year	Percent
1990	82.189
1991	82.363
1992	81.278
1993	80.476
1994	80.445
1995	79.871
1996	79.555
1997	79.68
1998	79.606
1999	79.694
2000	79.404
2001	79.295
2002	79.236
2003	79.544
2004	79.493
2005	80.84
2006	81.325
2007	81.886
2008	82.073
2009	82.231
2010	82.45
2011	82.761
2012	82.624
2013	82.646
2014	82.512
2015	82.184
2016	82.263
2017	82.321
2018	82.391
2019	82.466
2020	82.539
2021	82.583
2022	82.618
2023	82.649
2024	82.683
2025	82.722
2026	82.736
2027	82.747
2028	82.764
2029	82.798
2030	82.855