2017

6.4

2001

7.8

1996

6.8

1998

6.5

1997

7.1

2007

6.3

2006

6.8

1981

6.2

1982

5.9

1984

6.1

1985

5.3

2014

0.0

2005

5.8

2000

5.9

1979

6.1

2009

5.7

2008

8.0

2008

6.4

2006

5.0

2005

7.8