1992

6.3

1973

6.6

1982

6.1

1974

6.2

1973

4.8

1997

6.4

1975

6.8

2008

6.1

1981

6.7

2020

7.3

2017

8.5

2007

4.5

2008

5.0

1977

6.8

1976

5.6

2004

6.6

1972

6.3

1980

7.0

1996

6.8

1972

6.9