This Week's Chart By Numbers (28th June 2015)

1. 24: Highest climb by a single song.

James Bay's 'Let It Go' moved from No.34 ALL the way to No.10 in the space of a week. The previous two weeks saw Fetty Wap's 'Trap Queen' move up 11 places each countdown.

2. 2: Weeks at No.1.

'Not Letting Go' has now spent its second week at the top. If it can hold onto the pole position for another three weeks it will officially be the longest running No.1 of 2015.

3. 6: Non-movers.

Ed Sheeran's 'Photograph', Wiz Khalifa's 'See You Again', Tinie Tempahs' No.1 single 'Not Letting Go', Lost Frequencies' 'Are You With Me', Walk The Moon's 'Shut Up And Dance' and Mark Ronson's 'Uptown Funk' all hold onto their previous week's place.

4. 9: Biggest drop in places.

Carly Rae Jepsen's 'I Really Like You' dropped down to No.40 in it's tenth week in the top 40. Can you send Carly back up the charts?

5. 15: Amazing collaborations.

Selena Gomez's collaboration with A$AP Rocky was just one of fifteen collaborations in Sunday's countdown. Other notable entries included Kygo & Parson James, Martin Garrix & Usher and Krept & Konan with Jeremih.

6. 8: Awesome new entries on Sunday's show.

X Factor finalists Stereo Kicks made an appearance on Sunday's countdown with 'Love Me So' along with seven others. Click on the link below to see all eight new entries.

7. 2: New members of the 'double-digit club'.

Justin Bieber's collaboration with Diplo & Skrillez 'Where Are Ü Now' as well as Carly Rae Jepsen's 'I Really Like You' made their tenth appearance in the countdown. Picture: Instagram

8. 29: Most appearances by a single song.

Yup, of course it was! Mark Ronson's 'Uptown Funk' has cleared the 'half a year' mark and is nearly at 30 weeks in the chart.

9. 6: Former No.1 singles.

Years & Years' 'King', Mark Ronson's 'Uptown Funk', Jason Derulo's 'Want To Want Me', Wiz Khalifa's 'See You Again', Omi's 'Cheerleader' and Jess Glynne's 'Hold My Hand'.

Big Top 40

Sundays 4 - 7pm

This Week's Chart By Numbers (28th June 2015)