1986

0.0

1991

6.0

1997

5.2

2010

9.0

2003

4.0

2012

5.5

1983

6.5

1960

7.1

1993

0.0

1988

4.2

1982

4.8

1980

6.8

2009

5.8

1990

6.3

2015

0.0

2013

0.0

1980

0.0

1981

5.7

2006

3.9

2009

2.7