1980

6.7

2003

7.2

1981

5.4

2003

6.0

1983

5.5

1983

7.4

1993

6.5

1984

6.1

1985

5.4

2007

0.0

1995

5.9

1986

6.8

2002

5.6

1998

6.6

1994

6.2

1982

6.8

2006

6.1

2003

6.2

2006

5.6

2005

5.8