1950

5.7

2000

6.3

1953

6.9

1962

7.3

1998

6.6

1998

6.7

2003

5.8

1988

7.2

1968

7.3

1991

7.5

1960

6.4

1982

6.6

1939

5.8

1932

7.0

2016

6.7

2001

6.3

1996

6.6

2002

6.1

1973

8.0

1976

0.0