2004

5.6

1987

7.3

1999

6.8

1998

6.6

1993

5.5

1994

5.7

1993

5.0

2005

2.0

1997

1.0

2006

5.4

2004

4.8

2001

6.1

1976

3.0

1988

4.9

1995

6.6

2002

7.2

1999

7.4

2003

5.8

1958

5.3

1994

7.0