Kent expanded his business and incorporated physical sales to supplement information from radio stations from 1976.
Album certifications include both physical and digital sales.
Worldwide, the song has sold more than 2 million copies (physical sales and digital downloads).
Its calculation also considered digital and physical sales.
This feat was accomplished due to strong physical sales of the CD single.
Most of the single's success can be based on the physical sales of the single, as well as airplay, which it received.
It immediately became the number one physical single sales and reached the Top 10.
Delays of the physical single skewed sales towards internet downloads.
The single helped push the group's total physical single sales in the country to 647,000.
Atlantic Records reports that digital sales have surpassed physical sales.
