2005

7.0

2013

6.6

2011

5.5

1962

7.8

2014

8.5

1992

7.1

2011

9.5

1957

7.9

2010

5.9

1990

8.7

1993

6.0

2009

7.3

1987

7.1

1988

5.9

1967

4.3

1990

7.2

1990

6.9

2005

6.9

1974

7.0

2002

6.4