1927

8.1

1985

8.3

1932

7.8

1931

7.2

1988

7.9

1979

6.5

1982

7.5

1984

6.6

1989

7.8

1986

7.1

1989

5.7

1991

7.0

1994

6.5

1990

7.5

1996

7.3

1998

6.4

2002

6.3

1935

7.5

1920

7.9

1933

7.6