It sold 8 million, not that Diamond mess y'all lied about for years and mess at adjusting to climate why do you have to make an excuse for a gags to look impressive ?
If that's the case...21 would've sold 30M x 2.739...close to 90M...not very likely at all
Adele is an anomaly. Statistically she would be an outlier. You don't throw out a whole batch of data because you have 1 case that doesn't follow your trend line.