1995

0.0

1975

6.9

1973

6.3

1978

2.0

1971

6.5

1972

5.6

1969

6.6

1974

5.8

1971

5.8

1970

6.3

1971

6.0

1970

6.6

1974

5.8

1973

6.2

1972

6.8