2005

3.6

1976

3.3

1979

2.0

1993

5.6

2003

5.6

2006

4.9

2004

3.7

2004

4.0

1992

1.0

1993

3.3

2014

5.0

1978

4.2

2017

6.8

2015

5.1

1980

0.0

1980

0.0

1970

5.3

1989

4.8

1975

5.2

1978

1.7