1948

6.7

2008

6.6

2006

6.5

1994

5.9

1976

6.3

1999

6.5

2009

6.8

2008

6.7

1992

6.0

1930

4.1

1997

5.6

1986

7.4

2006

5.5

1996

5.3

2004

5.5

2002

6.5

2003

6.5

1993

6.2

1994

6.2

1994

6.0