1983

6.5

1983

4.5

1970

6.4

1977

6.8

1989

7.0

2010

6.3

1996

6.2

1979

7.3

1968

6.9

1982

7.5

1980

6.7

1962

7.9

2009

7.8

2019

7.1

2009

5.5

2014

5.0

1968

6.0

2017

7.4

1986

6.8