Year	Percent
1991	32.119
1992	37.869
1993	43.702
1994	42.818
1995	42.424
1996	44.955
1997	48.013
1998	54.911
1999	57.667
2000	57.641
2001	57.356
2002	56.218
2003	47.016
2004	59.804
2005	46.935
2006	34.599
2007	59.399
2008	44.856
2009	45.041
2010	45.052
2011	45.613
2012	48.764
2013	49.444
2014	48.438
2015	49.255
2016	52.401
2017	52.204
2018	51.625
2019	52.459
2020	53.133
2021	53.697
2022	54.336