Year	Percent
1991	7.969
1992	8.113
1993	8.358
1994	8.397
1995	8.524
1996	8.015
1997	8.149
1998	8.186
1999	7.808
2000	7.857
2001	8.549
2002	8.32
2003	8.274
2004	8.835
2005	9.449
2006	9.272
2007	9.264
2008	8.874
2009	8.474
2010	8.461
2011	8.527
2012	8.38
2013	8.139
2014	8.016
2015	7.779
2016	7.677
2017	7.666
2018	7.611
2019	7.563
2020	7.531
2021	7.503
2022	7.48