2003

7.5

2007

6.4

1999

5.6

2008

5.2

2004

4.7

1980

6.8

2006

4.3

1962

7.3

2008

1.5

2008

2.0

1994

5.8

1969

6.6

1986

8.0

2004

7.1

1998

5.6

1999

6.7

2007

6.7

2002

6.6

2004

6.4

2008

4.8