To celebrate 30 years on the air, we've done of digging, a put a list together of the songs that spent the longest at no.1 for each year since 1990:
1990
Put 'Em Under Pressure - The Republic of Ireland Football Squad (May 31st to August 23rd, 13 Weeks)
1991
Bryan Adams – (Everything I Do) I Do It For You (July 4th to September 5th, 10 weeks)
1992
Rhythm Is a Dancer - Snap! (August 13th to October 1st, 8 Weeks)
1993
I’d Do anything for Love – Meatloaf (October 17th to November 21st, 6 weeks)
1994
Riverdance (May 5th to September 2nd, 18 Weeks)
1995
Think Twice – Céline Dion (January 20th to March 17th, 9 weeks)
1996
Aon Focal Eile - Richie Kavanagh (March 22nd to May 3rd, 7 weeks)
Killing Me Softly - The Fugees (June 14th to May 3rd, 7 weeks)
1997
I Believe I Can Fly - R Kelly (April 18th to May 16th, 5 weeks)
https://www.youtube.com/watch?v=GIQn8pab8Vc
Elton John - Candle in the Wind (September 19th to October 17th, 5 weeks)
Perfect Day - Various Artists (November 28th to December 25th, 5 weeks)
1998
Believe – Cher (November 15th to December 20th, 6 weeks)
1999
...Baby One More Time - Britney Spears (February 21st to March 28th, 6 weeks)
2000
Maniac 2000 - Mark McCabe (March 4th to May 6th, 10 weeks)
2001
Uptown Girl - Westlife (March 10th to April 14th, 6 weeks)
Hey Baby (Uhh, Ahh) - Dj Otzi (July 28th to September 1st, 6 weeks)
2002
How You Remind Me - Nickleback (13th April to May 11th, 5 weeks)
2003
Where is the Love – Black Eyed peas (September 6th to November 1st, 9 weeks)
2004
Milkshake - Kelis (January 29th to February 26th, 5 weeks)
Everytime - Britney Spears (June 17th to July 15th, 5 weeks)
Do They Know It's Christmas - Band Aid 20 (December 2nd to December 30th, 5 weeks)
2005
You Raise Me Up - Westlife (October 27th to December 1st, 6 weeks)
2006
Hips Don't Lie – Shakira (June 15th to August 10th, 9 weeks)
2007
Umbrella - Rihanna feat Jay Z (May 24th to July 12th, 8 weeks)
Bleeding Love - Leona Lewis (October 25th to December 13th, 8 weeks)
2008
Now You’re gone – Bass Hunter (January 24th to February 21st, 5 week)
The Galway Girl - Sharon Shannon & Mundy (April 10th to May 8th, 5 weeks)
2009
I Gotta Feeling - Black Eyed Peas (July 16th to August 20th, & September 3rd to October 8th, 12 weeks)
2010
Telephone - Lady Gaga ft. Beyoncé (March 25th to April 15th, 4 weeks)
https://www.youtube.com/watch?v=EVBsypHzF3U
Stereo Love - Edward Maya & Vika Jigulina (May 27th to June 17th, 4 weeks)
https://www.youtube.com/watch?v=p-Z3YrHJ1sU
California Gurls - Katy Perry (June 24 to July 15th, 4 weeks)
https://www.youtube.com/watch?v=F57P9C4SAW4
2011
We Found Love - Rihanna ft. Calvin Harris (October 13th to November 24th, 7 weeks)
https://www.youtube.com/watch?v=tg00YEETFzg
2012
Beneath Your Beautiful - Labrinth ft. Emeli Sandé
https://www.youtube.com/watch?v=bqIxCtEveG8
2013
Blurrred Lines – Robin Thicke (May 16th to June 27th, 7 weeks)
https://www.youtube.com/watch?v=zwT6DZCQi9k
Wake Me Up - Avicii (July 4th to August 15th, 7 weeks)
https://www.youtube.com/watch?v=IcrbM1l_BoI
2014
Happy – Pharrell Williams (January 2nd to February 13th, March 6th to March 13th, April 3rd to April 17th, 12 weeks)
https://www.youtube.com/watch?v=ZbZSe6N_BXs
2015
What Do You Mean - Justin Bieber (September 3rd to October 15th, 7 weeks)
https://www.youtube.com/watch?v=DK_0jXPuIr0
2016
One Dance – Drake Feat Wizkid & Kyla (May 19th to July 21st, 10 weeks)
https://www.youtube.com/watch?v=iAbnEUA0wpA
2017
Despacito - Luis Fonsi and Daddy Yankee ft. Justin Bieber (May 5th to August 11th, 15 weeks)
https://www.youtube.com/watch?v=72UO0v5ESUo
2018
God's Plan – Drake (February 2nd to April 6th, 10 weeks)
https://www.youtube.com/watch?v=xpVfcZ0ZcFM
2019
Señorita - Shawn Mendes, Camila Cabello (June 28th to August 23rd, 9 weeks)
https://www.youtube.com/watch?v=xq866Q7GUlc