1972

7.9

1957

7.2

2004

6.8

2001

6.4

1999

6.2

1986

7.6

1979

7.3

1952

6.7

1958

7.0

2011

6.9

1988

6.2

1979

6.7

2001

6.0

2003

5.8

2016

4.2

2014

6.8

1983

6.8

2013

6.4

2013

6.9

1962

7.6