1984

8.1

1995

7.3

1993

7.2

1951

7.6

1983

4.3

1978

3.5

2005

7.0

1950

8.0

2003

7.8

2001

6.2

2001

7.4

1997

6.9

1962

8.0

1950

8.3

1998

6.4

1992

6.7

1995

8.2

1997

7.5

1998

6.8

1998

6.6