Year	Percent
1991	43.975
1992	43.541
1993	43.936
1994	44.599
1995	44.5
1996	45.338
1997	51.402
1998	50.21
1999	50.669
2000	49.319
2001	58.233
2002	56.999
2003	58.822
2004	55.882
2005	54.738
2006	52.19
2007	55.152
2008	53.532
2009	53.77
2010	55.48
2011	55.067
2012	54.839
2013	56.116
2014	57.175
2015	57.026
2016	56.216
2017	55.652
2018	55.507
2019	55.447
2020	55.631
2021	55.88
2022	56.182