1970

7.3

2002

6.8

2006

5.0

1994

7.9

2006

6.5

0.0

1971

7.6

1974

7.5

2006

3.5

1976

7.6

1978

7.1

1984

7.4

1996

5.9

1986

5.5

2002

6.1

1969

6.8

2003

7.7

1998

6.8

2001

7.3

2002

6.7