In the United States it means a sum of between one and two millions a year.

The Catholic Answers

The margin of difference is rather wide; however, taking the amount as two millions, on the Catholic population of the United States the average is again less than ten cents a year from the individual towards the support of Priests from this source. And at McCabe’s maximum, the individual Priest would receive the average income of one dollar per week from such Mass-offerings.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty