Year	Percent
1991	49.068
1992	50.446
1993	49.635
1994	49.485
1995	54.102
1996	55.264
1997	54.264
1998	46.439
1999	45.675
2000	54.187
2001	55.117
2002	54.928
2003	53.066
2004	53.817
2005	55.309
2006	52.399
2007	53.354
2008	47.85
2009	54.304
2010	48.905
2011	48.336
2012	48.327
2013	48.971
2014	45.705
2015	47.38
2016	47.607
2017	47.649
2018	47.492
2019	47.365
2020	47.231
2021	47.103
2022	46.977