1953

8.2

2001

5.2

1992

7.3

1994

6.3

1994

5.7

2001

7.5

2009

7.1

2003

4.7

1941

6.6

1939

6.1

2008

6.7

2005

5.4

1981

6.0

2009

6.6

2005

5.4

2014

0.0

1979

7.6

1925

0.0

1973

0.0

1946

7.0