1895

6.8

2013

5.4

2003

6.3

1998

6.8

1964

7.3

2004

5.8

1997

7.6

2006

7.9

2001

5.8

1991

5.3

2002

5.5

2009

7.4

2011

6.5

1993

6.7

2007

6.3

1995

5.9

2010

6.7

1949

7.7

1989

6.4

2009

6.2