2001

6.1

1950

7.6

1999

7.6

2000

7.1

2006

5.0

2007

5.4

1998

7.5

1963

6.5

1987

7.4

2001

6.4

2004

6.6

1979

7.2

1951

7.6

1969

6.7

1991

6.7

2000

8.1

1963

7.2

2011

7.1

1920

7.9

1929

7.8