1983

7.9

2003

6.4

1995

7.3

2017

6.0

2006

6.9

2012

6.3

2007

6.0

1992

6.3

2003

5.8

2007

7.4

2002

5.2

2000

6.1

2006

6.2

1984

5.4

7.8

1999

8.4

2005

7.5

2007

6.6

1985

6.2

2013

5.7