Year	Percent
1991	52.266
1992	49.003
1993	50.059
1994	49.239
1995	50.324
1996	53.704
1997	53.148
1998	51.9
1999	52.955
2000	51.804
2001	51.052
2002	53.442
2003	53.957
2004	51.9
2005	50.095
2006	52.639
2007	52.419
2008	51.725
2009	54.159
2010	55.648
2011	56.97
2012	56.916
2013	55.762
2014	50.419
2015	51.635
2016	48.362
2017	48.403
2018	48.205
2019	48.052
2020	47.883
2021	47.678
2022	47.473