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6.81
2
1921
6.80
4
1922
6.79
2
1923
6.79
2
1924
6.79
1
1925
6.78
3
1926
6.77
3
1927
6.75
5
1928
6.75
2
1929
6.75
2
1930
6.73
1
1933
6.73
0
1934
6.73
1
1935
6.73
0
1937
6.71
1
1939
6.71
3
1940
6.70
3
1941
6.69
1
1942
6.69
3
1943
6.68
2
1945
6.68
1
1946
6.67
1
1947
6.66
2
1948
6.64
3
1950
6.63
0
1951
6.62
2
1953
6.62
1
1954
6.62
0
1956
6.61
1
1957
6.61
1
1959
6.60
1
1962
6.59
1
1963
6.57
5
1964
6.56
1
1965
6.55
4
1966
6.55
8
1967
6.55
1
1968
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