1979

6.9

1996

6.5

2005

6.7

2002

7.6

1998

7.3

1932

6.9

2007

6.3

1973

7.0

2003

7.1

1997

6.5

2001

6.7

2001

6.5

2005

7.2

2005

6.6

1987

7.1

2016

0.0

2002

6.6

1990

7.8

1940

7.8

1961

7.5