658,000... Elton John's single Candle in the Wind sold an unprecedented 658,000 copies on its very first day of sale.
1,200... There have been a whopping 1,200 number ones since the first chart was published.
1955... was the year in which Bill Haley & His Comets released (We're Gonna) Rock Around The Clock. The jazzy number sold 1.42 million copies, making it the highest selling single of the 1950s.
1963... was the year She Loves You by The Beatles was released. The fab four went straight to number one and quickly became the highest-selling single of the 60s.
1984... Band Aid's Do They Know It's Christmas was released in 1984. It was the highest-selling single in the UK chart until Elton John's Candle in the Wind was released - and remains the highest-selling single of the 80s, as well as a festive staple to this day.
1997... Elton John's Candle in the Wind was released in 1997 as a tribute to the late Diana, Princess of Wales. The single still holds the title of the biggest-selling single since records began.