1992

6.8

2010

8.0

2002

7.4

2008

7.6

1995

7.6

1960

7.1

2012

6.7

2005

6.9

2004

7.8

2016

7.3

1963

5.7

1991

7.2

1958

6.7

2001

8.4

2002

7.9

1984

8.5

1957

7.7

2011

8.9

2013

7.8