2015

6.2

2013

6.5

2017

5.4

1987

0.0

1999

7.5

2016

1.0

1974

4.6

1993

4.5

1966

0.0

2013

5.5

1980

5.0

2006

9.0

2012

5.5

1964

5.6

1994

7.8