1985

7.1

1997

6.8

2007

6.8

1979

8.1

2018

6.0

2000

6.0

1992

0.0

1996

6.8

2002

6.7

2014

5.9

1988

5.6

2002

6.6

1918

0.0

1952

5.3

1931

4.9

1977

3.6

1932

6.9

1969

6.4

1957

6.8

1944

6.0