1981

5.2

1997

4.5

1985

0.0

1987

4.2

2002

7.0

1988

0.0

1964

7.0

2006

1.0

1998

5.0

1997

7.7

1971

6.4

1970

6.2

1996

0.0

1982

4.9

1992

3.4