1999

7.4

2003

5.9

1981

1.0

1988

5.0

2004

5.6

1987

7.3

1999

1.0

1980

1.0

2006

1.0

1969

2.8

1996

6.6

2002

7.1

2005

6.3

2001

6.7

1999

6.8

1998

6.6

1975

0.0

1973

1.0

2007

4.2

2003

3.5