Year	Percent
1990	72.259
1991	73.524
1992	74.723
1993	75.892
1994	76.721
1995	77.265
1996	78.069
1997	77.526
1998	78.167
1999	78.629
2000	78.559
2001	78.383
2002	78.578
2003	80.35
2004	80.493
2005	80.869
2006	81.308
2007	81.969
2008	82.778
2009	83.072
2010	83.368
2011	82.98
2012	83.013
2013	83.46
2014	83.027
2015	82.674
2016	82.748
2017	82.986
2018	83.224
2019	83.463
2020	83.703
2021	83.941
2022	84.177
2023	84.411
2024	84.644
2025	84.875
2026	85.106
2027	85.337
2028	85.566
2029	85.795
2030	86.024