Year	Percent
1991	10.466
1992	11.078
1993	11.13
1994	11.957
1995	10.219
1996	10.749
1997	11.821
1998	11.86
1999	10.747
2000	9.524
2001	10.151
2002	9.652
2003	8.536
2004	9.807
2005	9.128
2006	9.885
2007	9.616
2008	8.762
2009	9.228
2010	9.07
2011	9.16
2012	8.85
2013	8.757
2014	9.63
2015	7.05
2016	5.762
2017	5.698
2018	5.592
2019	5.514
2020	5.427
2021	5.332
2022	5.238