2012

5.5

1985

5.2

1930

3.0

1958

7.5

1961

7.8

1981

7.2

1991

6.0

1976

7.0

2008

7.2

2005

6.1

2002

6.2

1970

7.3

2006

4.6

2004

7.2

1997

6.6

1992

6.0

1994

7.6

1994

6.7

2000

5.0

1999

6.6