1971

0.0

1993

5.5

1972

4.2

2000

4.8

1985

2.0

1982

4.1

1999

5.3

1996

4.6

1997

4.7

1970

2.3

2003

5.7

1979

6.0

1980

2.9

1981

3.8

1983

7.0

1979

5.3

1999

3.7

1997

3.4

1989

5.2

2000

2.6