2000

7.8

1983

8.2

1987

7.8

1973

6.4

1983

6.2

1982

6.4

2004

7.2

1942

0.0

1948

7.5

1975

6.1

1999

6.4

1990

5.8

1992

6.9

1930

5.0

2002

5.8

2006

6.6

2000

6.4

1992

6.3

1998

6.5

1996

5.3