1984

6.1

1998

7.2

1994

8.4

2007

6.6

1980

0.0

1999

7.5

2006

6.8

2006

0.0

2010

7.5

2010

7.3

2009

7.6

2010

7.0

1979

0.0

2001

7.8

2007

7.0

2014

7.2

2002

5.9

2001

7.4

1977

5.5

1955

0.0