Year	Percent
1992	41.09589
1993	41.48226
1994	42.14963
1995	43.69512
1996	45.87285
1997	46.78609
1998	46.64559
1999	46.46997
2000	46.46997
2001	46.64559
2002	48.85845
2003	50.72006
2004	52.86266
2005	56.37513
2006	61.69301
2007	61.53495
2008	61.42606
2009	61.33825
2010	60.94134
2011	59.64524
2012	59.11486
2013	59.11486
2014	59.03407
2015	58.89357
2016	58.89708
2017	58.8725
2018	58.91465
2019	58.90411
2020	58.86898
2021	58.82754