1965

7.1

1963

7.0

1953

7.3

1955

7.2

1961

6.9

1987

6.4

1970

7.3

1977

6.8

1983

6.2

1994

6.7

1994

6.9

1990

6.0

1969

5.0

2016

0.0

2016

6.0

2011

5.9

1927

4.3

2010

4.5