1965

6.1

1966

6.1

1966

5.6

1968

6.4

1976

7.4

1968

4.2

1963

6.9

1964

6.6

1969

5.5

1965

6.3

1966

6.2

1953

6.6

1960

6.3

1964

6.3

1975

6.3

1970

7.5

1952

0.0

2017

6.7

1999

6.8

2004

4.8