1989

5.1

1991

7.5

2008

6.3

1990

6.2

1947

7.6

2004

6.1

1960

7.8

1983

5.7

2004

6.9

1965

6.8

1964

6.7

1962

7.6

1967

6.5

1987

5.5

1999

7.3

1967

6.9

1963

6.9

1952

6.7

2003

7.3

1988

5.2