In 2006, 12.9 million families in the US were headed by a single parent  , 80\% of which were headed by a female.
In 2020, 10.7 million families in the US were headed by a single parent with children under the age of 18 , 80\% of which were headed by a female.
R
2006, 12.9
2020, 10.7
A
with children under the age of 18