2008

5.2

1986

6.4

2009

7.0

1987

4.1

2015

5.7

2013

7.1

1968

7.1

1977

8.0

2002

7.0

2000

6.1

2012

6.3

2010

7.2

1957

8.1

1999

7.3

1975

7.5

2014

4.6

1949

6.9

1994

7.3

1938

7.5

1976

7.8