Year	Percent
1991	75.124
1992	63.581
1993	64.566
1994	69.141
1995	65.771
1996	71.562
1997	72.002
1998	69.889
1999	71.91
2000	69.134
2001	68.701
2002	69.429
2003	68.981
2004	67.857
2005	74.272
2006	75.258
2007	72.855
2008	69.728
2009	67.639
2010	68.075
2011	68.282
2012	66.699
2013	66.524
2014	66.995
2015	67.849
2016	68.2
2017	70.282
2018	71.227
2019	71.886
2020	71.718
2021	71.83
2022	71.857