1947

6.7

1998

5.5

2009

5.5

2009

7.7

1975

7.3

2009

6.7

2012

5.5

2020

6.9

1984

6.9

1985

8.1

1997

5.3

2010

7.4

1990

5.9

2008

6.3

2011

5.8

1895

5.6

2005

6.0

2004

6.4

2003

6.5

2009

6.5