2006

6.9

1994

7.4

2007

7.1

1988

6.5

1967

7.7

1966

6.9

1966

7.6

1998

6.3

2009

6.0

1990

6.7

1992

0.0

1987

6.5

1993

8.1

2007

5.0

1999

6.0

2012

0.0

1954

6.0

2004

7.2

1991

8.3

1981

7.4