2003

7.9

2014

6.3

2004

8.1

1990

7.1

2004

8.6

2013

6.8

2016

8.6

2014

7.9

2001

7.8

2011

8.3

2009

8.3

2004

8.3

1998

7.2

1975

7.0

2008

8.9

1985

7.5

2007

8.1

2008

8.4

2001

7.8

2010

7.8