2010

6.6

1999

4.1

2002

0.0

1994

1.0

1979

3.3

2001

1.0

1985

3.8

2002

5.5

1979

0.0

1993

6.4

1983

6.0

1978

5.3

1975

3.0

1973

0.0

1977

6.2

1995

6.7