DATAFILE EXPOSURE: 07.06.08.

Mercy is far and away the year's biggest airplay hit, with 35,317 plays on the Music Control panel earning it a whopping audience of 1.09bn - enough to put it a massive 48.23% ahead of nearest challenger, Rockstar by Nickelback.

In addition to having the number one song of the year, Duffy has the number one song of the week, with Mercy follow-up Warwick Avenue moving to pole position with an audience of 59.57m generated by 1,648 plays.

Its arrival at the summit comes just eight weeks after Mercy ended a seven-week stay at the top of the airplay chart, and helps boost sales of Duffy's debut album Rockferry to their highest level for 10 weeks. Its accession to the throne was helped considerably by Radio Two, where it was the week's most-played song, with 17 airings. It commanded an identical number of plays on Radio One, where it was the 12th most- played song.

Australian teenager Gabriella Cilmi's Sweet About Me completes a remarkable return to the Top 20 this week, reaching a new chart peak nine weeks after it first made the Top 20, and five weeks after falling as low as number 419. The track, which also reaches a new sales peak ...