2009

6.0

2004

6.3

1972

6.9

2005

5.6

2006

5.4

2004

4.8

2001

6.1

2006

5.9

2001

7.3

1984

6.0

1997

6.8

2005

6.6

2005

6.8

1976

3.3

1999

6.8

1998

6.6

1993

5.5

1999

7.4

2003

5.8

1970

7.1