1997

5.5

2010

0.0

2010

0.0

1990

6.0

1981

0.0

1975

0.0

1993

6.0

1979

0.0

1993

0.0

1985

0.0

1978

0.0

1995

5.5

1984

7.4

1994

7.2

1999

6.8

1998

7.0

2006

7.4

1989

8.0

1989

8.3

2007

7.9