Year	Percent
1991	47.866
1992	62.802
1993	71.598
1994	72.142
1995	71.012
1996	72.023
1997	61.985
1998	71.055
1999	72.264
2000	68.82
2001	69.185
2002	66.905
2003	66.98
2004	66.788
2005	66.051
2006	65.684
2007	65.203
2008	59.3
2009	58.63
2010	56.202
2011	60.951
2012	64.238
2013	59.67
2014	58.43
2015	59.011
2016	59.432
2017	59.635
2018	59.595
2019	59.58
2020	59.588
2021	59.55
2022	59.526