1989

5.5

2005

5.2

1987

5.2

1996

6.5

1952

6.7

2003

6.8

1975

6.4

1999

5.9

1988

6.2

1999

5.7

1959

6.1

1955

7.4

1988

6.1

1995

5.6

1996

5.8

1954

6.7

1988

6.3

1965

7.1

2001

6.4

1993

6.6