Year	%
1987	3.3
1994	3.2
1995	3.7
1998	3.9
1999	2.6
2000	3
2003	3.3
2004	3.2
2005	3.2
2006	3.7
2007	3.5
2008	3.8
2009	4.1
2010	4.1
2011	4.4
2012	4.3
2013	4.5
2014	4.8
2015	4.6
2016	4.7
2017	4.7
2018	4.6
2019	4.5
2020	4.1
2021	4.6
2022	4.7