1988

2.0

1999

4.4

1983

6.5

1981

7.0

2003

7.0

2017

6.0

2002

7.0

1967

6.2

1990

6.3

1984

7.1

1998

4.9

1945

7.7

1995

7.7

2006

7.1

1991

7.6

1993

5.4

2000

5.5

2005

6.5

2004

5.6

2008

7.0