2000

7.3

2005

4.5

1984

7.5

1991

6.4

1967

7.2

2006

5.5

1977

6.0

1971

7.6

2004

10.0

1976

7.0

1982

7.2

1993

7.1

1993

6.3

2002

5.8

1992

6.7

1978

7.1

1969

7.1

1966

6.6

1991

7.6

1968

7.4