2014

6.8

1980

8.1

2018

6.9

2017

4.0

2002

7.3

1958

6.4

1974

0.0

1973

7.4

1949

6.0

1999

6.8

1998

7.2

1995

6.5

1937

6.0

1975

7.5

1956

6.7

1978

5.0

2003

6.1

2002

7.7

1997

6.6

2007

6.5