1993

6.7

1991

0.0

1983

5.0

1977

5.5

1980

6.7

2006

4.1

1986

5.9

1992

2.0

2003

7.2

1984

7.2

1990

6.2

2008

6.6

2004

1.8

2003

8.0

2002

7.5

2000

7.4

1977

4.6

2006

5.2

1985

7.5

1996

6.1