1968

6.1

2001

6.2

2018

6.7

1956

6.1

2008

7.5

2011

7.1

2015

6.0

1987

7.0

1971

6.9

1995

5.5

1988

4.8

1976

5.5

1976

6.5

1965

7.4

1975

5.6

2010

6.9

2003

6.1

1994

5.3

2018

7.2

1993

5.8