1984

8.5

1998

7.5

2004

9.5

1997

6.9

2006

7.8

1972

7.7

2007

8.2

2019

8.0

1995

7.2

2002

7.9

2016

8.4

2018

7.9

1992

8.2

2016

8.0

1976

7.9

1998

9.9

1996

8.1

1991

7.0

2003

7.8

1960

7.1