2007

7.9

2005

8.6

2009

7.7

2001

8.3

2011

8.3

2005

8.3

2005

8.1

2006

7.5

2010

8.0

1987

8.3

2015

7.5

2010

7.8

2008

8.5

1975

8.2

2004

6.3

1989

8.3

2002

7.4

1996

6.3

2011

8.5

1999

7.9