2009

7.2

1963

9.3

2006

6.0

2002

6.0

2010

6.9

2011

5.6

2007

6.9

1980

5.7

1987

6.8

1990

6.5

1982

6.2

1973

6.8

2003

7.3

2017

6.8

1988

7.2

1997

6.8

1999

7.4

2000

5.0

2011

7.1

1965

7.4