Year	%
1986	1.8
1990	2.1
1994	2.2
1998	2.1
2005	2
2006	2
2009	2
2011	2.9
2012	3
2013	3.1
2014	2.8
2015	2.9
2016	2.8
2017	2.7
2018	2.7
2019	2.8
2020	2.8
2021	2.7
2022	2.8