2005

6.7

1995

6.7

2004

6.9

1970

6.1

1995

7.4

2017

5.9

2006

4.4

2003

6.3

2001

7.7

1929

7.0

2002

6.6

1996

7.3

1968

9.0

2003

6.4

1915

0.0

1992

7.0

2001

6.9

1979

7.0

1998

6.6

2004

6.4