2002

7.5

2000

7.4

2003

7.1

2003

6.7

1974

6.5

2009

4.3

1984

5.8

1978

6.1

2006

6.9

1991

6.2

1990

6.7

1993

5.5

1967

0.0

2007

6.2

1963

0.0

2003

7.2

1970

7.0

2005

5.4

1986

7.2

1994

4.5