1954

7.9

2007

6.2

1947

7.6

1971

6.4

1977

6.8

1980

8.2

1999

8.0

1969

8.0

2000

8.2

1987

6.5

1994

8.3

1998

7.8

1932

7.8

2004

7.4

1986

7.6

2006

5.6

1995

8.4

1931

8.1

2004

7.2

1951

7.7