2011

5.9

2006

6.1

2009

5.4

1989

5.2

2013

6.1

2000

5.2

2009

6.0

2016

6.6

2009

6.0

2007

5.7

2010

5.7

2006

5.5

1990

7.7

1980

6.7

2012

6.4

1998

6.6

2007

6.6

2001

6.2

1980

6.3

1972

6.4