2003

8.4

2009

5.3

1980

4.3

1981

7.3

1985

5.7

2007

5.4

1999

4.8

2006

5.0

2011

6.1

2007

8.2

2018

5.0

2014

5.5

2015

9.0

2003

6.0

1991

6.1

1994

4.9