2001

5.0

1999

6.6

2006

7.1

2000

7.4

2003

4.1

2012

6.5

1973

4.5

2002

7.5

1974

0.0

1984

6.9

2006

6.7

2007

6.1

1976

6.8

1990

5.6

1997

6.2

2005

6.2

2003

6.6

2007

6.9

2006

6.6

1991

6.4