1997

10.0

2008

7.0

2006

5.5

2004

10.0

1976

7.1

1982

7.2

1993

6.9

1993

6.4

2002

5.9

1992

6.7

1969

7.1

1966

6.7

1991

7.6

1968

7.4

2002

8.6

1998

7.7

1982

6.0

2005

0.0

1986

7.9

1987

6.0