1970

7.5

2006

6.8

1999

6.7

2004

6.7

2007

6.6

1974

7.5

1987

8.1

1994

7.4

1953

7.7

2002

7.1

1997

6.9

1982

0.0

1958

6.0

1962

4.9

2000

7.4

2017

6.9

1975

7.4

1937

7.9

1988

7.2

2002

6.4