Year	%
1987	4.6
1991	4.6
1995	4.7
2000	4
2003	3.9
2004	3.9
2005	4
2006	3.8
2007	3.8
2008	3.8
2009	3.8
2010	3.7
2011	3.8
2012	3.9
2013	3.8
2014	3.9
2015	3.8
2016	3.9
2017	3.8
2018	3.8
2019	3.8
2020	3.9
2021	3.8