Year	Percent
1991	7.582
1992	7.556
1993	7.12
1994	7.639
1995	6.527
1996	8.141
1997	8.235
1998	8.318
1999	9.559
2000	5.817
2001	9.466
2002	9.412
2003	9.514
2004	9.664
2005	10.013
2006	10.142
2007	10.106
2008	9.957
2009	9.986
2010	9.602
2011	10.456
2012	10.785
2013	10.478
2014	10.01
2015	9.237
2016	9.271
2017	9.272
2018	9.274
2019	9.277
2020	9.279
2021	9.282
2022	9.285