1990

6.1

1970

6.0

2006

6.3

1977

6.7

1988

7.6

1993

7.3

1951

5.8

1996

5.4

2000

6.3

1930

6.8

2010

6.1

1965

7.4

1986

5.8

2013

6.1

1997

6.3

1947

7.0

2005

5.4

2012

5.5

1988

7.1

1956

6.2