2006

7.5

2005

6.8

1990

5.8

1972

3.2

2008

6.3

1981

6.5

1983

6.7

2009

5.0

2006

6.3

1992

5.8

1980

6.8

1993

7.8

1991

5.3

2002

3.6

2003

7.1

1987

5.5

1970

6.4

1942

7.3

2004

5.0

2002

7.4