1986

6.7

1994

6.0

1993

5.7

1991

7.3

1988

7.8

2006

4.7

1987

7.3

1982

0.0

2003

5.1

2005

7.0

1999

6.3

2005

3.5

2006

5.0

2009

1.5

2009

1.3

2013

5.1

1996

5.0

1992

6.5

1987

0.0

2013

0.0