1983

8.2

2005

6.9

2009

6.4

2000

5.2

1994

6.7

2007

7.3

1991

6.5

2017

6.2

1981

6.5

2014

6.6

2005

5.4

1982

7.3

2018

4.0

2006

7.6

2002

7.5

1943

6.2

2008

0.0

2018

8.7

1989

6.3

2004

6.3