1964

7.0

1975

7.8

2006

7.4

2007

6.3

1999

7.2

1995

5.8

2007

5.7

1972

7.1

1997

7.9

2006

5.9

1954

7.0

1933

7.6

2005

6.7

1984

6.7

1988

6.1

1963

1.0

1974

5.0

1982

0.0

1941

5.8

2002

7.3