2006

5.6

2009

6.8

1967

7.3

2001

6.1

1977

6.8

2013

8.1

2018

5.9

1996

7.4

2004

8.0

1992

6.2

2012

7.1

2011

6.1

2009

6.4

1989

6.3

1997

6.2

2011

6.5

2007

5.6

2015

7.1

2009

5.5

2004

5.7