Where it comes from
Our calculation from other figures in the trainer’s notes.
Show the working
- n/a
Explore / Figure
Record
Search status, 2011-2017
2011-2017
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.