2001

6.9

1979

7.7

1977

7.7

1990

7.0

1996

7.6

1940

7.9

1989

6.9

1939

7.9

2017

7.2

1999

6.8

1992

7.6

2001

7.5

2004

5.6

1985

8.3

1994

7.5

2005

7.4

1925

8.0

1931

7.1

1931

8.3

2006

7.0