1976

2.8

2000

6.2

1976

4.5

2000

4.9

1974

2.7

1971

5.3

2003

6.2

2005

5.5

2006

5.5

2007

5.7

1964

6.8

1959

7.1

2002

5.3

2009

0.0

2002

5.6

1976

3.1

1983

3.0

1974

3.8

2005

6.4

0.0