2011

8.1

1984

7.3

2007

6.1

2002

7.1

1949

7.9

1969

6.6

1973

8.0

1965

7.6

1989

7.2

1941

7.7

1998

7.9

1995

6.5

2010

4.6

1996

6.0

1971

7.5

1978

8.0

1961

7.0

1903

7.0

1896

7.1

1963

7.5