2006

6.7

1980

8.4

1971

6.0

1995

5.9

1993

6.5

1961

8.1

2006

7.5

2006

6.1

1994

6.9

1973

5.9

1951

7.7

1957

7.9

1972

7.5

1995

7.7

1948

8.0

1995

5.6

1987

7.2

2008

6.7

1997

7.7