1998

6.5

2007

2.0

2006

6.7

2003

6.5

2013

0.0

1998

4.4

2011

5.9

1993

6.8

1970

7.5

2001

6.3

2005

6.1

1998

9.4

1973

6.9

1982

6.4

1994

6.7

1977

6.2

2004

6.4

1975

6.1

2008

6.3

2008

7.1