1973	5.5	5.6	5.2	4.8	4.4	5.4	5	4.7	4.7	4.2	4.6	4.6
1974	5.7	5.8	5.3	4.8	4.6	5.8	5.7	5.3	5.7	5.5	6.2	6.7
1975	9	9.1	9.1	8.6	8.3	9.1	8.7	8.2	8.1	7.8	7.8	7.8
1976	8.8	8.7	8.1	7.4	6.8	8	7.8	7.6	7.4	7.2	7.4	7.4
1977	8.3	8.5	7.9	6.9	6.4	7.5	7	6.8	6.6	6.4	6.5	6
1978	7.1	6.9	6.6	5.8	5.5	6.2	6.3	5.9	5.8	5.4	5.6	5.7
1979	6.4	6.4	6.1	5.5	5.2	6	5.9	5.9	5.7	5.6	5.6	5.7
1980	6.9	6.8	6.6	6.7	7.1	7.8	7.9	7.6	7.2	7.1	7.1	6.9
1981	8.2	8	7.7	7	7.1	7.7	7.3	7.2	7.3	7.5	7.9	8.3
1982	9.4	9.6	9.5	9.2	9.1	9.8	9.8	9.6	9.7	9.9	10.4	10.5
1983	11.4	11.3	10.8	10	9.8	10.2	9.4	9.2	8.8	8.4	8.1	8
1984	8.8	8.4	8.1	7.6	7.2	7.4	7.5	7.3	7.1	7	6.9	7
1985	8	7.8	7.5	7.1	7	7.5	7.4	6.9	6.9	6.8	6.7	6.7
1986	7.3	7.8	7.5	7	7	7.3	7	6.7	6.8	6.6	6.6	6.3
1987	7.3	7.2	6.9	6.2	6.1	6.3	6.1	5.8	5.7	5.7	5.6	5.4
1988	6.3	6.2	5.9	5.3	5.4	5.5	5.5	5.4	5.2	5	5.2	5
1989	6	5.6	5.2	5.1	5	5.5	5.3	5.1	5.1	5	5.2	5.1
1990	6	5.9	5.5	5.3	5.2	5.4	5.6	5.5	5.6	5.5	5.9	6
1991	7.1	7.3	7.2	6.5	6.7	7	6.8	6.6	6.5	6.5	6.7	6.9
1992	8.1	8.2	7.8	7.2	7.3	8	7.7	7.4	7.3	6.9	7.1	7.1
1993	8	7.8	7.4	6.9	6.8	7.2	7	6.6	6.4	6.4	6.2	6.1
1994	7.3	7.1	6.8	6.2	5.9	6.2	6.2	5.9	5.6	5.4	5.3	5.1
1995	6.2	5.9	5.7	5.6	5.5	5.8	5.9	5.6	5.4	5.2	5.3	5.2
1996	6.3	6	5.8	5.4	5.4	5.5	5.6	5.1	5	4.9	5	5
1997	5.9	5.7	5.5	4.8	4.7	5.2	5	4.8	4.7	4.4	4.3	4.4
1998	5.2	5	5	4.1	4.2	4.7	4.7	4.5	4.4	4.2	4.1	4
1999	4.8	4.7	4.4	4.1	4	4.5	4.5	4.2	4.1	3.8	3.8	3.7
2000	4.5	4.4	4.3	3.7	3.8	4.1	4.2	4.1	3.8	3.6	3.7	3.7
2001	4.7	4.6	4.5	4.2	4.1	4.7	4.7	4.9	4.7	5	5.3	5.4
2002	6.3	6.1	6.1	5.7	5.5	6	5.9	5.7	5.4	5.3	5.6	5.7
2003	6.5	6.4	6.2	5.8	5.8	6.5	6.3	6	5.8	5.6	5.6	5.4
2004	6.3	6	6	5.4	5.3	5.8	5.7	5.4	5.1	5.1	5.2	5.1
2005	5.7	5.8	5.4	4.9	4.9	5.2	5.2	4.9	4.8	4.6	4.8	4.6
2006	5.1	5.1	4.8	4.5	4.4	4.8	5	4.6	4.4	4.1	4.3	4.3
2007	5	4.9	4.5	4.3	4.3	4.7	4.9	4.6	4.5	4.4	4.5	4.8
2008	5.4	5.2	5.2	4.8	5.2	5.7	6	6.1	6	6.1	6.5	7.1
2009	8.5	8.9	9	8.6	9.1	9.7	9.7	9.6	9.5	9.5	9.4	9.7
2010	10.6	10.4	10.2	9.5	9.3	9.6	9.7	9.5	9.2	9	9.3	9.1
2011	9.8	9.5	9.2	8.7	8.7	9.3	9.3	9.1	8.8	8.5	8.2	8.3
2012	8.8	8.7	8.4	7.7	7.9	8.4	8.6	8.2	7.6	7.5	7.4	7.6
2013	8.5	8.1	7.6	7.1	7.3	7.8	7.7	7.3	7	7	6.6	6.5
2014	7	7	6.8	5.9	6.1	6.3	6.5	6.3	5.7	5.5	5.5	5.4
2015	6.1	5.8	5.6	5.1	5.3	5.5	5.6	5.2	4.9	4.8	4.8	4.8
2016	5.3	5.2	5.1	4.7	4.5	5.1	5.1	5	4.8	4.7	4.4	4.5
2017	5.1	4.9	4.6	4.1	4.1	4.5	4.6	4.5	4.1	3.9	3.9	3.9