1987

7.2

1980

6.7

2020

7.2

1989

7.8

2002

7.2

2002

7.3

1997

7.4

1994

6.5

1990

7.5

2004

7.7

1940

7.9

1972

8.7

1994

7.1

1990

7.2

1994

8.3

1987

7.5

1930

7.8

1985

7.0

1997

7.5

1967

7.7