1999

8.0

2004

8.2

2006

6.3

1995

6.9

1974

7.0

1989

9.5

2002

8.0

2004

6.8

1976

6.3

1982

5.3

2007

0.0

1993

6.4

2005

7.5

2005

8.8

1978

6.6

2003

8.6

1973

8.0

1996

5.3

1987

4.3

1998

8.0