Year	Percent
1991	6.209
1992	6.69
1993	6.217
1994	6.14
1995	5.794
1996	5.833
1997	5.634
1998	5.453
1999	5.236
2000	5.17
2001	5.055
2002	5.218
2003	5.558
2004	4.89
2005	4.773
2006	5.003
2007	4.573
2008	3.515
2009	3.845
2010	3.9
2011	3.809
2012	3.868
2013	4.166
2014	3.912
2015	3.735
2016	3.983
2017	3.993
2018	3.926
2019	3.87
2020	3.82
2021	3.778
2022	3.741