2006

6.5

2004

6.4

1991

3.6

1994

7.8

1981

5.5

1998

5.9

2012

5.6

2005

5.3

1992

5.9

1986

6.7

1996

5.4

2007

5.1

1993

7.9

2000

0.0

2010

7.1

1979

5.3

2001

3.2

2008

8.4

1985

7.2

1994

4.5

1992

6.5

2003

7.4