2011

7.1

1955

7.2

1988

6.5

1989

6.2

1979

6.2

2005

5.9

2004

9.9

2010

6.4

2009

6.4

1965

7.5

1987

5.3

1988

5.7

2014

6.3

2007

6.5

1986

6.6

1990

6.7

1994

5.9

1974

7.0

1999

7.6

1950

6.8