2001

7.4

1991

5.8

2007

6.5

1996

7.0

2003

6.6

2002

5.5

1970

3.8

1991

4.7

1973

3.5

1966

2.5

2006

6.2

2012

6.0

2004

5.3

2006

6.3

1978

5.9

1975

7.5

2010

5.2

2018

2.3

1977

4.7

2013

0.0