Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual
1957	12.3	13.0	11.4	8.6	5.1	1.7	0.5	2.0	3.5	6.1	7.8	11.0	6.9
1958	12.5	13.7	11.9	8.6	5.0	2.0	0.8	2.2	3.4	6.4	8.1	10.8	7.1
1959	12.4	13.8	12.5	8.6	5.2	2.0	0.7	2.2	3.5	6.4	7.7	10.7	7.1
1960	12.2	13.9	12.3	8.6	5.3	2.0	0.8	2.1	3.3	6.1	7.5	10.8	7.1
1961	12.3	13.6	12.0	8.6	5.1	1.9	0.7	2.1	3.4	6.2	7.8	10.8	7.1
1962	13.2	13.1	10.9	7.5	4.9	3.8	1.8	3.2	5.2	5.8	8.8	11.8	7.5
1963	12.4	12.4	12.6	7.7	7.6	3.4	2.4	2.4	4.1	8.1	8	12	7.8
1964	12.4	11.5	10.6	9	3.1	4.1	1.8	2.3	5.2	6	9.8	9.4	7.1
1965	10.9	12.5	9.9	7.2	4.7	1.2	0.7	2.6	6.6	9.1	8.6	12.4	7.2
1966	12.4	12.1	11.1	7.7	3.2	1.6	0.9	2.5	4.7	7	9.9	11.7	7.1
1967	13.2	13	9.9	7.7	3.3	5.5	2.4	3	4.4	8.8	9.4	9.3	7.5
1968	14.1	14.9	14.1	9.4	5.4	2.7	0.7	2.8	3	5.9	10.3	10.7	7.8
1969	14.6	14.7	12.5	8.2	5.1	4	2.2	4.4	3.7	7.2	9.6	10.5	8.1
1970	12.4	13.8	9.2	7.1	3.9	3	0.9	2.3	4	8.2	9.1	12.5	7.2
1971	13.2	14.2	12.5	8.5	4.1	2.9	-0.1	1.7	3.8	6	8.2	11.4	7.2
1972	12.3	12.9	11.2	7.1	5.6	2.4	2.4	3.6	5	7.1	9.6	11.6	7.6
1973	14.5	15	11.9	8.7	5.4	3.8	3.5	3.2	5.9	8.9	9.6	13.1	8.6
1974	14.8	12.7	12.8	10.7	5.5	2.1	1.7	3.1	4.2	7	8.6	10.5	7.8
1975	12	13.3	9.6	5	2.7	1.5	0.7	0.9	4	5.3	8.4	12.9	6.4
1976	13.2	14.1	12.2	6.6	2.3	2.7	0.5	1.4	3.7	7.4	8.5	10.9	7
1977	12.3	12.4	12.2	6.2	5.1	2	-0.8	0.9	3.9	6.7	9.8	11.3	6.8
1978	14	13.4	12.7	8	5.8	4	1.2	2.1	5	6.8	9.8	10.9	7.8
1979	14.7	14.4	11.4	6.7	4.4	2.4	0.7	1.8	5.1	7.5	10.5	11.7	7.6
1980	13.3	13	12.1	6.8	7.5	2.4	1.6	2.4	5.4	8.3	9.3	12	7.8
1981	15	15.1	10.5	8.5	5.2	3.4	2	2.9	5	9.1	9.8	12.7	8.3
1982	14.4	13.6	12.3	7	2	1.5	0.5	0.9	3.6	5.9	9	12.1	6.9
1983	12.8	15.6	13.3	7.7	7	3.6	0.6	3.5	5.9	8.1	8.6	11.7	8.2
1984	12.1	13.1	9.4	8.7	3	0.6	2	3.4	4.2	6.4	11	9.9	7
1985	11.1	11.9	12.3	9.1	6	1.8	0.5	2.1	3.5	7.4	9.4	12	7.3
1986	11.7	12.9	12.7	10.5	6.4	2.7	2.8	4	6.2	7.3	8.9	10.6	8.1
1987	13.9	13.6	11.9	9	6	4.9	1.7	5.1	6	7.1	10.6	11	8.4
1988	12.2	12.9	11.6	9.3	5.4	2.5	1.8	3.7	5.0	7.1	10.0	10.9	7.7
1989	12.2	12.8	12.1	9.5	5.9	3.0	2.2	3.7	5.0	7.4	9.2	11.4	7.9
1990	13.1	13.2	11.8	9.2	5.9	3.7	2.7	3.8	5.3	7.3	9.7	13.4	8.3
1991	14.9	14.4	11.3	8	6.4	7.1	3.6	3.5	5.2	9.2	9.1	11.1	8.6
1992	12.5	12.6	12.7	8.8	5.8	3.2	2.3	2.3	3.9	6.8	7.5	10.7	7.4
1993	14.1	13.2	10.4	9.1	5.7	2.5	4.2	4	5	6.9	8.4	11.9	8
1994	13.4	14.1	9.7	9.3	6.1	4.9	2.7	2.1	4.6	7	10.2	12.1	8
1995	12.7	12.5	10.9	7.2	7.3	3.7	1.5	4.4	5.2	7.9	10	10.8	7.8
1996	13.5	11.3	11	7.8	7.1	4.4	2.4	3.8	6.2	8.2	8.5	10.9	7.9
1997	11.7	14.7	11.8	8.1	7.3	3.5	2.3	2.5	5.8	8.4	11.5	13.5	8.4
1998	14.6	15.2	12.9	9.9	7.3	4.8	3.4	5.2	7.8	8.2	8.7	12.9	9.2
1999	15	13.6	13	8.1	7.3	4.3	3.5	4	7	9.5	7.8	11.4	8.7
2000	11	14.7	13.4	9.4	6.2	3.2	2.9	3	6.9	8.7	12	13.4	8.7
2001	13.3	17	11.6	8.1	4	3	3	2.5	6.8	6.7	9	11.6	8.0
2002	12.7	13.4	11.2	9.2	4.8	3.2	0.3	1.3	4	7.2	11.4	12	7.6
2003	13.6	15.2	10.9	8.6	6.3	3.5	2.8	2.1	4.9	6.4	9.1	13.1	8
2004	14.2	14.4	11.8	9	4.6	3.2	2.2	3.7	4.9	8.2	10.1	12.2	8.2
2005	13.4	13	10	9.6	5.9	3.6	3.2	2.3	5.2	9.4	10.8	11.8	8.2
2006	15.1	13.1	12.1	6	3.4	1	3.3	2	4.9	6.8	9.7	11.4	7.4
2007	14.4	14.2	12.9	8.8	6.4	2.8	2.4	5.5	5.2	8.7	11.4	12.1	8.7
2008	13.7	12.5	10.7	6.1	3.3	6.4	1.5	1.4	5.4	7.9	10.2	11.1	7.5
2009	12.7	14.2	11.9	9.4	4.7	3.7	2.6	3.5	6	7.5	11.9	12.6	8.4
2010	14.4	15.1	11.7	8.6	3.9	2.8	1.5	3.3	5.4	8.7	11.1	12.4	8.2
2011	15.2	14.9	12.8	7.9	2.8	3.7	2.1	3.7	5.9	7.6	11.9	9.9	8.2
2012	12.9	13	11.4	8.5	3.4	3.5	2.8	2.4	4.6	6.1	10.5	12.4	7.6
2013	14.4	13.5	12	7.9	3.8	4.3	3	3.9	6.9	7.3	9.2	11.7	8.2
2014	13.2	13.8	13.2	9.3	5.1	4.7	2.3	2.5	6.1	8	11.5	13.4	8.6
2015	14.3	13.8	11.4	9.1	5.9	1.8	1.5	2.9	4.7	9.7	11.4	11.6	8.2
2016	13.9	13.9	13.6	10.1	6.7	4.7	4.3	3.7	6.6	6.9	10.1	14.1	9.1
2017	16.1	14.8	14.3	7.4	4.9	2.8	1.7	2.6	5	8.9	10	14.4	8.6
2018	14.4	13.5	11.9	10.6	4.7	3.6	1.8	2.7	3.9	9	10.5	14.1	8.4
2019	17.2	13.8	13.5	9.6	5.7	3.6	3.4	2.4	4.6	7.2	10.7	12.2	8.7