1965

5.0

1986

4.6

1989

3.3

1997

5.2

1975

4.7

1995

9.0

1987

5.9

1978

7.0

1981

2.0

1982

7.1

1967

7.6

1980

6.1

1971

7.3

1995

6.8

1999

5.5