|
|
1889
|
30.8
|
|
1890
|
36.0
|
|
1891
|
30.7
|
|
1892
|
31.8
|
|
1893
|
31.9
|
|
1894
|
30.5
|
|
1895
|
28.4
|
|
1896
|
34.8
|
|
1897
|
32.8
|
|
1898
|
31.1
|
|
1899
|
23.8
|
|
1900
|
31.7
|
|
1901
|
32.2
|
|
1902
|
32.6
|
|
1903
|
30.0
|
|
1904
|
34.0
|
|
1905
|
29.0
|
|
1906
|
32.6
|
|
1907
|
38.3
|
|
1908
|
34.3
|
|
1909
|
34.1
|
|
1910
|
27.6
|
|
1911
|
34.2
|
|
1912
|
26.5
|
|
1913
|
28.2
|
|
1914
|
30.9
|
|
1915
|
30.2
|
|
1916
|
31.9
|
|
1917
|
31.8
|
|
1918
|
31.8
|
|
1919
|
30.6
|
| 1920 |
33.6 |
| 1921 |
35.8 |
| 1922 |
31.2 |
| 1923 |
35.0 |
| 1924 |
33.0 |
| 1925 |
30.3 |
| 1926 |
35.0 |
| 1927 |
34.6 |
| 1928 |
31.3 |
| 1929 |
28.7 |
| 1930 |
32.4 |
|
|
|
1931
|
33.7
|
|
1932
|
34.4
|
|
1933
|
30.0
|
|
1934
|
39.6
|
|
1935
|
37.5
|
|
1936
|
31.3
|
|
1937
|
31.0
|
|
1938
|
34.5
|
|
1939
|
32.2
|
|
1940
|
31.6
|
|
1941
|
34.2
|
|
1942
|
29.7
|
|
1943
|
36.1
|
|
1944
|
31.4
|
|
1945
|
32.2
|
|
1946
|
31.9
|
|
1947
|
32.3
|
|
1948
|
29.2
|
|
1949
|
28.6
|
|
1950
|
35.3
|
| 1951 |
32.6 |
| 1952 |
34.8 |
| 1953 |
35.4 |
| 1954 |
37.6 |
| 1955 |
31.0 |
| 1956 |
31.2 |
| 1957 |
35.0 |
| 1958 |
36.5 |
| 1959 |
32.3 |
| 1960 |
27.9 |
| 1961 |
32.0 |
| 1962 |
28.3 |
| 1963 |
31.3 |
| 1964 |
29.2 |
| 1965 |
33.8 |
| 1966 |
31.1 |
| 1967 |
33.4 |
| 1968 |
28.9 |
| 1969 |
35.0 |
| 1970 |
36.8 |
| 1971 |
35.9 |
| 1972 |
34.0 |
|
|
|
1973
|
29.2
|
|
1974
|
31.7
|
|
1975
|
31.3
|
|
1976
|
35.9
|
|
1977
|
32.7
|
|
1978
|
30.0
|
|
1979
|
24.8
|
|
1980
|
33.1
|
|
1981
|
39.4
|
| 1982 |
33.1 |
| 1983 |
34.3 |
| 1984 |
27.8 |
| 1985 |
30.1 |
| 1986 |
35.2 |
| 1987 |
32.4 |
| 1988 |
27.4 |
| 1989 |
29.2 |
| 1990 |
31.0 |
| 1991 |
30.7 |
| 1992 |
34.8 |
| 1993 |
28.4 |
| 1994 |
31.3 |
| 1995 |
34.0 |
| 1996 |
31.5 |
| 1997 |
31.0 |
| 1998 |
31.8 |
| 1999 |
35.3 |
| 2000 |
35.9 |
| 2001 |
28.5 |
| 2002 |
30.6 |
| 2003 |
33.0 |
| 2004 |
33.0 |
| 2005 |
34.5 |
| 2006 |
32.9 |
| 2007 |
29.5 |
| 2008 |
30.0 |
| 2009 |
34.1 |
| 2010 |
27.9 |
| 2011 |
29.8 |
| 2012 |
31.3 |
| 2013 |
30.3 |
| 2014 |
31.2 |
|
|
| 2015 |
33.0 |
| 2016 |
35.9 |
|
2017
|
34.7 |
|
2018
|
33.7 |
| 2019 |
33.2 |
| 2020 |
33.8 |
| 2021 |
30.8 |
| 2022 |
33.8 |
|