polyhex

I only have about 5 years of Oz data, but in that 5 years Beautiful Soul - Jesse McCartney fell to 15 from 1 (in 2005) no big climbers in the last few years either.

All have big jumps from outside the top 40

Fallers in US: Then Came You - Dionne Warwick And The Spinners and Nothing From Nothing - Billy Preston both fell from 1 to 15