1992

7.2

1999

6.5

1988

4.8

1996

5.8

2000

6.1

1988

6.2

2007

6.5

2004

6.8

1969

4.2

1990

4.0

2001

5.7

1997

5.3

1971

5.3

1989

0.0

1990

6.6

1998

6.3

1991

6.5

1994

6.1

1995

5.2

1970

6.5

1995

8.1

1991

6.2

1988

6.6