1985

6.9

1979

7.1

1992

6.3

1985

6.5

1994

5.6

2003

5.6

1992

7.2

1997

6.5

2001

5.7

1994

7.4

2004

6.6

2003

6.1

1981

0.0

1980

7.0

2003

5.5

2001

6.0

2002

6.4

1968

0.0

1984

6.9

1978

7.4