Where it comes from
The line in the source
May 1977–Sep 2018 (cumulative) | — | 418,840,006
Explore / Figure
Record
Cumulative issue copies 1977 2018, May 1977-Sep 2018
418,840,006 copies May 1977-Sep 2018
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.