Year	Percent
1991	75.556
1992	64.532
1993	63.656
1994	67.798
1995	64.557
1996	72.034
1997	72.149
1998	68.471
1999	71.761
2000	69.561
2001	69.445
2002	70.888
2003	70.807
2004	69.938
2005	78.513
2006	80.275
2007	79.555
2008	74.538
2009	71.103
2010	71.624
2011	71.427
2012	71.059
2013	70.85
2014	71.5
2015	72.642
2016	72.723
2017	75.551
2018	76.483
2019	77.123
2020	76.946
2021	77.042
2022	77.053