2003

7.8

2001

5.1

1988

7.1

1975

5.5

1976

5.6

1969

3.5

2009

7.5

1993

7.7

2002

5.5

2004

5.5

2007

4.2

1968

7.6

2006

7.4

2014

5.3

1969

4.5

2000

3.7

1997

0.0

2009

6.5

1993

0.0

2005

6.5