1994

6.7

1997

7.5

2014

6.3

2004

7.2

2002

5.8

1981

5.4

1980

3.5

2007

7.2

2008

6.8

2006

6.0

2007

6.4

2014

5.1

0.0

1983

6.8

2018

6.9

2007

6.9

2011

5.2

1986

6.7

2016

6.1

2000

6.3