Year	Percent
1991	64.952
1992	67.528
1993	68.826
1994	69.203
1995	71.811
1996	73.179
1997	74.477
1998	75.27
1999	76.003
2000	74.589
2001	77.055
2002	77.854
2003	80.835
2004	81.862
2005	82.569
2006	84.5
2007	86.269
2008	88.615
2009	87.537
2010	86.508
2011	87.077
2012	88.948
2013	87.927
2014	89.316
2015	90.74
2016	90.471
2017	90.862
2018	91.079
2019	91.314
2020	91.514
2021	91.696
2022	91.869