Where it comes from
The line in the source
believed to be about 55 percent
Record
55% Before 2016
EstimateOur model or estimate. Treat it as an order of magnitude.
Found in one pass only. The research team reads every source twice, independently; this record turned up in one reading but not the other, so treat it as less certain than its grade.
The line in the source
believed to be about 55 percent