Music sales

I talk to friends about declining hard-copy music sales, and they look a bit befuddled – why would you care, so what?, and so on. I was interested, therefore, to see a report on the BBC that Elvis Presley’s latest UK #1 single, and 1000th overall UK #1, had the lowest sales of any #1 since 1969. I haven’t seen anything on this, but I wondered if it sold many download copies?