1982

6.7

1988

6.3

1989

5.1

1993

6.5

2016

6.1

2002

6.9

1986

6.1

1965

6.8

1959

6.1

1987

6.8

1963

7.2

1974

6.0

1993

7.3

1999

5.9

1987

5.3

2017

6.6

1983

5.7

2017

6.5

1998

6.5

1970

6.3