Table:
2003 to 2009
2009 to 2014

percent

change in technological frontier
-7.0
11.9

percentage points

contribution

high-productivity cohort
-8.4
7.0

low-productivity cohort
4.9
4.2

entrants after 2002
-3.5
0.7

Statement: the contributions of the high-productivity cohort were -8.4 percentage points.
Question: what was the percentage points of the contributions of the high-productivity cohort?
Answer: [-8.4]