2002

6.2

2000

7.1

1995

7.3

1996

6.7

1977

0.0

1995

7.3

1998

0.0

1988

5.9

2006

5.1

2002

6.1

2001

6.9

2007

6.9

2003

6.6

2001

6.8

1977

7.4

1991

6.0

2003

0.0

1980

4.9

1936

6.8

2004

3.5