Year	Percent
1991	77.647
1992	78.627
1993	79.601
1994	80.063
1995	79.955
1996	80.327
1997	80.786
1998	80.303
1999	81.425
2000	81.858
2001	82.458
2002	82.626
2003	83.696
2004	84.637
2005	84.796
2006	85.346
2007	85.955
2008	86.914
2009	87.191
2010	87.323
2011	88.3
2012	88.63
2013	88.673
2014	89.061
2015	89.064
2016	89.102
2017	88.971
2018	89.226
2019	89.483
2020	89.674
2021	89.833
2022	89.961