2002

6.3

2006

6.1

2008

7.0

2005

5.5

1997

6.9

2008

1.5

2005

0.0

2004

6.2

2000

6.8

1997

6.5

2003

6.5

2000

5.6

2021

7.3

2007

4.8

2018

5.6

2007

5.4

2014

7.1

1977

0.0

1988

0.0

2015

5.9