2009

7.0

1989

7.8

1980

8.4

2010

7.3

2006

6.7

2013

7.6

1973

7.7

1997

6.7

2007

7.8

1982

8.1

2005

5.5

2003

8.0

1963

7.9

1969

6.6

1992

8.1

1972

7.5

2007

7.2

1977

7.7

1995

5.9

1966

8.1