2011

4.7

1980

5.6

1976

0.0

1979

0.0

1989

5.0

1997

5.0

1990

6.0

1994

1.0

1983

6.5

1974

2.0

1969

0.0

1985

5.9

1981

0.0

2004

5.8

2003

5.2

1984

7.3