1999

8.0

1984

6.9

1998

7.7

1996

6.9

1996

7.3

2005

4.5

1986

7.7

1996

7.6

1973

7.0

1985

7.8

2007

7.3

1948

7.7

2008

6.3

2012

6.2

1993

7.0

2016

6.2

1985

7.2

1979

6.6

1955

6.0

2014

6.7