2002

8.3

1995

7.8

1984

8.4

1998

10.0

2006

9.3

2010

8.5

2015

6.9

2005

8.7

2014

7.2

2012

8.6

1988

7.6

1960

7.4

2015

8.2

2009

8.0

2001

7.7

2004

8.4

2013

7.5

1989

8.3

2016

7.3

2012

6.3