1996

6.7

2003

0.0

1986

6.0

2006

7.5

1984

7.2

1996

5.4

2001

6.9

1993

7.1

1993

6.2

1978

4.9

2006

6.5

1995

5.7

1975

5.8

1972

6.7

1998

5.2