1992

5.8

1996

6.4

1994

4.5

1988

8.0

1995

6.5

1954

7.9

2002

6.3

1988

5.0

2001

6.8

1962

7.7

2003

7.2

1975

7.3

1997

6.7

2002

6.6

1999

7.4

1974

8.6

1990

7.4

2003

7.2

1955

7.5

1955

6.8