Year	Percent
1991	74.096
1992	75.66
1993	76.451
1994	77.331
1995	79.517
1996	79.816
1997	80.153
1998	81.411
1999	82.01
2000	82.401
2001	83.723
2002	83.843
2003	85.003
2004	85.524
2005	86.193
2006	87.086
2007	88.151
2008	87.704
2009	87.567
2010	88.307
2011	89.21
2012	89.802
2013	90.998
2014	90.886
2015	91.597
2016	91.928
2017	92.058
2018	92.206
2019	92.308
2020	92.404
2021	92.484
2022	92.567