1989

7.5

1981

5.2

2007

5.1

1997

3.3

1994

4.7

2012

5.6

1990

7.4

1988

0.0

1984

8.4

1970

1.0

1985

5.0

1984

7.2

1975

0.0

1984

4.2

1989

4.9

1991

6.0

1985

5.2