Here’s another piece from Guttmacher on pre-Roe abortion statistics. Bolded text mine:

Poor women and their families were disproportionately impacted. A study of low-income women in New York City in the 1960s found that almost one in 10 (8%) had ever attempted to terminate a pregnancy by illegal abortion; almost four in 10 (38%) said that a friend, relative or acquaintance had attempted to obtain an abortion. Of the low-income women in that study who said they had had an abortion, eight in 10 (77%) said that they had attempted a self-induced procedure, with only 2% saying that a physician had been involved in any way.

Guttmacher Institute - Lessons from Before Roe: Will Past Be Prologue?