That stopped when the priests realized that most of the people couldn't actually use a quipu in that manner: the converts had to return to the quipu specialists to obtain a quipu and a list of sins that corresponded to the knots. After that, the Spanish worked to suppress the use of the quipu.
Average sonographer salary. An average hourly rate (wage) and the annual salary for sonographers in the United States is around $31.90 per hour and $66,360 per year.
The U.S. Bureau of Labor Statistics (BLS) reports that diagnostic medical sonographers earned a mean annual wage of $68,390, or $32.88 per hour, in May of 2014. Workers who were in the top 10% of wage estimates for this vocation at that time had yearly incomes of $93,850 or greater.