1970

3.8

2007

6.4

2006

6.3

2012

6.0

2006

6.2

2003

6.6

2004

5.3

2018

2.3

1966

2.5

1996

7.0

1991

4.7

2013

0.0

1973

3.7

2001

7.4

1991

5.9

2010

5.1

1978

5.9

2000

4.6

1977

4.7

1975

7.5