1971

7.8

1977

5.2

1970

6.7

1973

6.8

1996

4.8

1992

0.0

1981

5.1

1990

7.4

2001

7.6

1999

7.9

1971

6.7

1972

6.8

1985

7.5

2001

6.8

1975

7.3

1990

3.9

2000

2.0

1973

5.8

2014

6.5

1974

7.3

1970

7.5

1970

6.8

1972

6.2

1977

0.0

1978

5.0

1990

5.0

1976

6.2

1989

5.2