1997

7.7

1989

6.1

2001

7.9

1953

8.0

1980

9.0

2005

7.0

2003

7.8

2003

7.8

2002

8.4

1969

7.1

2014

5.9

2004

7.1

2002

7.4

1984

7.1

1999

8.5

1976

8.2

1982

8.9

1941

8.0

1996

0.0

2006

7.0