1999

6.8

2017

6.3

2001

7.5

2018

6.9

1975

7.5

1956

6.7

1937

6.0

1995

6.5

1978

5.0

2003

6.1

1992

7.4

1977

0.0

2002

7.7

1997

6.6

1991

6.3

1948

0.0

1980

8.1

1998

6.9

1940

7.0

1999

6.5