Answer
See the picture.
Work Step by Step
$Cumulative~relative~frequency=\frac{cumulative~frequency}{sum~of~all~frequencies}$
Total (sum of all frequencies): $6+435+1053+1197+958+489+106=4244$ thousands births.
Cumulative relative frequency for "10-14" is $\frac{6}{4244}\approx0.0014$
Cumulative relative frequency for "15-19" is $\frac{441}{4244}\approx0.1039$
Cumulative relative frequency for "20-24" is $\frac{1494}{4244}\approx0.3520$
Cumulative relative frequency for "25-29" is $\frac{2691}{4244}\approx0.6341$
Cumulative relative frequency for "30-34" is $\frac{3649}{4244}\approx0.8598$
Cumulative relative frequency for "35-39" is $\frac{4138}{4244}\approx0.9750$
Cumulative relative frequency for "40-44" is $\frac{4244}{4244}=1$
