2013

5.2

1995

4.8

2011

5.5

2006

6.0

1983

6.0

1994

4.4

1972

6.5

1999

6.0

2005

4.3

1950

7.8

2012

4.5

1990

6.3

2013

6.0

1958

6.3

1993

6.7

1998

5.0

2010

7.6

1994

6.8

1979

6.4

1991

5.7