Year	Percent
1990	75.541
1991	75.624
1992	77.05
1993	78.339
1994	79.528
1995	79.841
1996	80.509
1997	81.106
1998	82.631
1999	82.502
2000	81.655
2001	83.02
2002	84.001
2003	84.939
2004	85.842
2005	86.716
2006	87.573
2007	88.391
2008	87.983
2009	88.569
2010	88.431
2011	88.37
2012	88.273
2013	87.895
2014	87.331
2015	86.475
2016	86.475
2017	86.814
2018	87.14
2019	87.455
2020	87.759
2021	88.052
2022	88.337
2023	88.613
2024	88.879
2025	89.136
2026	89.381
2027	89.618
2028	89.851
2029	90.086
2030	90.324