1989

4.5

1985

3.8

1974

6.0

2000

6.2

1994

5.5

2008

5.5

1970

4.2

2009

4.3

2002

7.2

2002

2.5

2003

6.2

2012

2.3

2000

5.3

1991

3.5

1977

5.2

2007

4.3

0.0

1976

6.9

1993

6.2

1988

5.4