2011

6.2

2018

7.1

2016

5.6

1973

5.7

1967

6.4

2006

4.6

1994

5.4

2002

6.0

2004

4.9

1978

5.8

1979

5.5

1940

6.0

1963

7.8

1960

4.0

1990

6.1

2009

7.3

1957

6.1

1968

1.5

1998

5.7

1943

6.2