1982

4.7

1975

6.5

2004

8.3

2006

6.2

1995

6.8

1974

6.9

1989

9.5

2002

8.0

2004

6.8

1976

7.0

1982

5.5

2007

8.5

1993

6.5

2005

7.5

1978

6.8

1973

8.0

1996

5.4

1987

4.3

1998

7.9

1992

5.8