1986

6.4

2003

8.0

2002

7.5

2000

7.4

2013

7.6

2008

6.5

2007

6.7

1992

6.8

2006

5.3

1985

7.5

2006

6.5

1993

6.9

2007

5.5

1991

7.1

1992

7.2

1993

6.5

1997

5.9

1981

0.0

2005

4.9

1982

7.0