Year	%
1999	2.54
2001	2.17
2002	1.72
2003	1.2
2004	1.6
2005	1.27
2006	1.07
2007	1.15
2008	1.15
2009	1.46
2010	2.53
2011	2.09
2012	2.13
2013	2.54
2014	3.14
2015	3.34
2016	3.55
2017	3.63
2019	4.13
2020	2.85
2021	3.49