Year	%
2001	2.43
2003	2.27
2004	2.41
2005	2.28
2006	1.94
2007	2.42
2008	2.27
2009	2.69
2010	2.8
2011	3.08
2012	2.41
2013	2.23
2014	2.39
2015	2.93
2016	2.13
2017	2.22
2019	4.09
2020	3.11
2021	3.61