Assertion: daughter | /r/HasProperty | natural birth rate
Facets:
value: since the 18th century
type: TEMPORAL
Source sentences:
text: In the United States, the birth rate is 105 sons to 100 daughters which has been the natural birth rate since the 18th century.
text: In the United States, the birth rate is 105 sons to 100 daughters which has been the natural birth rate since the 18th century.