1988

4.7

1992

7.5

1986

6.0

2008

4.5

1983

6.9

2000

4.8

1992

6.0

2001

7.1

1979

6.8

2012

6.6

1989

6.7

1996

7.6

1990

6.1

2006

5.1

1993

6.7

2007

5.2

1993

0.0

1997

6.4

1999

6.4

1994

0.0

2001

0.0