Year	%
1993	3.12
1998	2
1999	1.97
2000	2.23
2001	1.98
2002	1.98
2003	2.06
2004	2.08
2005	2.15
2006	2.18
2007	2.35
2008	2.46
2009	2.47
2010	2.39
2011	2.5
2012	2.34
2013	2.23
2014	2.3
2015	2.69
2016	2.75
2017	2.82
2018	2.32
2019	2.61
2020	2.42
2021	2.44