1953

5.4

2002

6.1

2016

5.6

2006

5.8

1995

7.3

1974

7.1

2003

6.0

1969

6.4

1939

6.7

1957

6.8

1967

6.5

1974

7.5

1955

7.9

2000

4.8

1970

5.8

2000

5.8

2000

7.3

1972

4.7

1957

5.5

1966

4.3