2008

8.9

1997

8.1

2010

8.1

2008

7.6

1982

7.5

2009

6.1

2002

7.7

2012

8.1

2006

8.6

2017

7.6

2009

8.0

1964

7.9

2008

7.7

2015

7.5

2011

8.1

1998

7.2

1987

8.4

2009

7.1

2011

7.4

2016

7.6