Year	%
1990	3.5
1993	3.3
1996	3.1
1999	2.7
2002	2.3
2005	2.4
2008	2.1
2010	2
2011	2.1
2012	2.1
2013	2.5
2014	2.5
2015	2.6
2016	2.7
2017	2.6
2018	2.7
2019	2.8
2020	3.1