2001

5.4

1968

5.8

2003

7.5

1991

7.5

2004

5.9

2006

5.5

2005

5.7

2007

5.2

1992

4.4

2007

6.0

2010

6.3

1999

5.1

1975

5.5

1969

5.0

1999

6.7

2003

3.5

1993

7.6

1988

1.0

1976

0.0

2014

5.3