Sales have resulted in two gold albums, eight multi-platinum albums, and two diamond albums (including seven consecutive multi-platinum albums between 1978 and 1987).
Penjualan album-album mereka telah menghasilkan dua album emas, delapan album multiplatina, dan satu album piringan intan (termasuk 7 album multiplatina berturut-turut antara tahun 1978 dan 1987).