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 technological frontier fully recovered after 2009, the contributions of the low-productivity cohort were 4.2 percentage points.
Question: the technological frontier fully recovered after 2009, what was the percentage points of the contributions of the low-productivity cohort?
Answer: [4.2]