2006

5.2

1985

4.1

2015

7.7

2013

0.0

2003

10.0

1999

5.3

1997

5.8

1994

5.0

1993

6.0

1991

5.7

1976

5.8

1997

1.0

2009

7.5

2011

6.7

1998

4.8