1996

7.5

1977

5.2

1997

6.6

2000

7.7

2001

7.2

2006

8.2

2003

8.0

2004

8.6

1999

6.9

1996

8.1

1979

6.7

2000

8.5

1982

6.0

1981

0.0

2005

7.9

1983

5.6

1997

7.7

2008

0.0

1999

8.2

1988

3.2