1985

3.3

1981

4.5

1979

4.9

1982

5.0

1981

5.3

1996

4.3

1981

7.0

2003

8.4

1996

4.9

1995

5.0

2001

5.3

2007

5.7

1994

3.6

1976

0.0

1974

1.0