2011

7.1

2012

6.3

1984

6.5

2010

5.5

1987

6.7

2004

5.9

2013

5.9

2007

6.4

1982

5.8

1967

6.5

2011

6.4

1982

6.6

2007

6.8

2013

7.2

1999

8.0

2002

4.3

1990

4.5

2013

7.3

1962

7.4

1994

6.5