1999

0.0

1983

6.0

2015

7.0

2016

4.9

2016

4.7

1979

2.0

2016

6.4

1975

8.7

1969

0.0

1981

0.0

2015

6.1

1976

5.2

1984

6.7

2007

4.2

1990

5.2

2006

5.7

2009

2.7

2008

5.0