1974

4.6

1984

7.6

1980

5.7

1989

4.1

2002

0.0

1983

6.2

1972

6.2

1985

6.7

1976

0.0

1990

5.9

1975

6.0

1999

7.8

1981

5.8

2005

7.0

1984

7.2

1980

7.2

1993

6.4

1992

6.6

1982

6.9

1975

6.3

1983

7.5

1979

7.3

1990

7.4

1977

7.2

1976

6.2

1987

6.5

1973

4.0

1974

6.2

2012

6.6

1973

6.8

1982

6.7