1981

6.6

1975

4.4

1989

7.2

1986

7.3

1979

6.8

2006

6.6

1997

6.8

2006

7.4

2001

5.4

2000

7.1

1998

6.9

1965

0.0

2000

0.0

1979

6.7

1991

6.2

1963

8.2