Year	Percent
1991	4.943
1992	5.146
1993	4.43
1994	3.973
1995	3.949
1996	3.854
1997	2.497
1998	2.599
1999	3.078
2000	2.645
2001	1.967
2002	2.003
2003	1.826
2004	2.176
2005	3.105
2006	2.246
2007	2.274
2008	3.137
2009	2.277
2010	2.766
2011	2.639
2012	2.339
2013	2.217
2014	2.962
2015	2.162
2016	2.03
2017	1.986
2018	1.873
2019	1.763
2020	1.674
2021	1.61
2022	1.546