2009

7.4

2011

7.1

1995

6.7

1955

7.2

2010

7.2

1999

5.1

2000

7.7

2012

5.9

1967

6.5

1984

6.6

2008

7.5

1966

6.3

1983

5.5

1970

6.0

2017

8.0

1943

8.0

1996

5.4

1993

5.8

2008

5.8

1984

7.1