Year	Percent
1990	75.16
1991	75.509
1992	75.601
1993	76.056
1994	74.942
1995	77.804
1996	86.534
1997	85.342
1998	84.317
1999	83.006
2000	81.622
2001	81.458
2002	77.719
2003	76.355
2004	76.778
2005	77.135
2006	78.841
2007	80.251
2008	81.19
2009	80.713
2010	81.391
2011	81.46
2012	81.876
2013	81.502
2014	82.992
2015	83.102
2016	82.457
2017	83.069
2018	83.679
2019	84.243
2020	84.726
2021	85.032
2022	85.235
2023	85.354
2024	85.417
2025	85.444
2026	85.336
2027	85.181
2028	84.992
2029	84.786
2030	84.577