2010

7.0

2012

6.1

2011

7.4

2005

6.6

1949

6.2

1988

5.2

1983

6.5

1999

5.1

1989

6.0

1992

5.7

2004

5.9

1963

6.8

2008

6.3

2005

5.9

1983

5.7

1986

6.3

2008

7.2

1989

7.0

2009

6.1