2001

6.9

2004

6.1

2001

7.3

1972

6.3

1961

7.6

2005

6.0

1983

5.0

1976

7.0

1979

5.3

2006

6.5

1981

6.0

1987

5.6

2009

5.9

2002

5.9

1983

4.2

2008

7.5

2003

6.6

1992

4.4

2007

5.9

2003

6.0