1968

6.9

1966

6.1

1987

7.0

2009

6.7

2016

6.7

1992

6.7

1989

7.1

1989

7.3

2020

9.4

1973

6.9

1977

6.6

2006

9.8

1976

6.7

1961

7.8

2004

10.0

1967

7.5

1967

7.3

1989

6.2

2012

6.4

1990

7.5