Year	%
1999	3.9
2001	2.56
2002	2.29
2004	2.06
2005	2.14
2006	1.82
2007	2.54
2009	3.5
2010	3.45
2011	3.87
2012	3.45
2013	3.74
2014	4.38
2015	3.61
2016	4.31
2017	4.52
2018	4.74
2019	2.53
2020	2.23
2021	1.97