1994

8.3

1998

6.7

1996

7.2

2002

8.4

1993

8.6

2001

7.9

2002

6.3

1984

7.1

2002

8.0

1975

4.0

1943

8.2

2006

0.0

1988

6.2

1981

8.1

1947

6.5

1950

6.2

1947

4.8

1946

7.1

1953

6.1

2001

8.2