1950

6.8

1964

6.3

1952

6.2

1964

6.2

1965

6.1

1965

6.2

1955

7.2

1954

5.4

2003

6.3

1963

6.8

1964

6.6

2001

6.8

1953

6.5

1962

7.0

1965

6.9

1966

6.3

1968

6.2

1954

6.1

1957

0.0

1968

7.7