Year	Percent
1991	49.076
1992	49.5
1993	51.146
1994	50.416
1995	48.837
1996	48.636
1997	50.269
1998	50.654
1999	50.466
2000	50.752
2001	50.122
2002	49.901
2003	49.516
2004	47.326
2005	47.25
2006	48.535
2007	49.738
2008	49.484
2009	49.72
2010	50.32
2011	50.312
2012	50.487
2013	51.573
2014	52.471
2015	52.492
2016	54.021
2017	53.954
2018	54.074
2019	54.029
2020	54.203
2021	54.351
2022	54.485