Year	Percent
1991	14.69
1992	15.016
1993	13.065
1994	13.23
1995	12.885
1996	12.663
1997	12.415
1998	12.517
1999	13.23
2000	14.219
2001	13.298
2002	12.678
2003	11.567
2004	11.062
2005	11.964
2006	11.685
2007	11.15
2008	11.325
2009	11.331
2010	11.082
2011	10.862
2012	10.633
2013	11.366
2014	11.386
2015	11.178
2016	10.599
2017	10.822
2018	10.882
2019	10.825
2020	10.816
2021	10.83
2022	10.768