Year	Percent
1991	54.826
1992	51.028
1993	51.771
1994	51.3
1995	51.16
1996	54.53
1997	53.595
1998	51.626
1999	51.617
2000	52.72
2001	51.781
2002	53.949
2003	53.336
2004	52.765
2005	51.285
2006	52.409
2007	51.648
2008	51.062
2009	51.988
2010	54.017
2011	56.811
2012	56.693
2013	54.04
2014	47.928
2015	48.796
2016	44.978
2017	45.001
2018	44.794
2019	44.639
2020	44.468
2021	44.262
2022	44.058