1966

6.3

1963

6.9

1964

6.6

1956

7.7

1953

6.6

2001

6.8

2008

5.9

1968

6.2

1965

6.7

1967

7.1

1949

6.9

1950

6.8

1954

5.4

2003

6.3

1955

7.2

1975

2.9

1965

6.2

1956

6.5

1956

5.5

1967

6.2