1971

7.5

1978

7.4

1964

7.6

1931

0.0

1975

6.5

1980

5.5

2006

5.4

1956

6.8

1989

6.9

2000

7.0

1997

5.9

1988

6.7

2004

6.5

1973

7.1

2014

6.6

2000

6.6

2008

5.9

1997

5.7

1977

6.6

1974

4.5