2001

3.6

1992

5.5

2000

5.7

1972

7.7

1972

9.5

1985

4.4

1977

0.0

1972

0.0

1990

1.0

1979

6.0

1998

3.5

1992

7.0

1995

4.9

2007

5.7

1984

4.6

1964

0.0

2003

5.6

1983

1.0

1967

5.5

2004

6.2

1973

7.2

1968

6.0

1978

4.8

2003

4.0

1988

5.6

2007

5.8

2004

4.2

1987

4.4

1992

4.5

1997

4.4

1990

5.4