1990

7.0

1997

6.6

2014

5.4

2016

3.0

1991

5.3

2013

0.0

2003

8.1

2006

6.4

2014

5.6

2001

6.2

2000

4.9

1989

5.6

2007

5.5

1989

5.3

1984

7.2

2001

5.1

2008

5.2

2005

4.5

2005

7.7

1977

6.8