1961

7.3

1994

3.2

2004

7.1

2005

6.7

2006

5.3

1996

6.1

1980

6.6

1953

6.4

1932

6.0

1948

6.7

1991

5.1

2018

0.0

1952

6.3

1945

7.2

1970

5.5

1921

0.0

2014

5.6

1928

6.4

2017

6.0

1985

5.7