2004

7.9

2018

7.6

2014

8.5

1997

7.1

2011

7.8

2009

7.4

2010

8.1

1962

7.2

2007

7.6

2001

7.7

2010

7.9

2008

7.8

2006

7.3

1969

7.8

2002

7.4

1979

7.3

2008

7.6

1984

7.5

1998

6.9

1989

8.2