Though album sales tend to produce more revenue and, over time, act as a greater measure of an artist's success, this chart receives less media attention than the UK Singles Chart, because overall sales of an album are more important than its peak position. 2005 saw a record number of artist album sales with 126.2  million sold in the UK. In February 2015, it was announced that due to the falling sales of albums and rise in popularity of audio streaming, the Official Albums Chart would begin including streaming data from March 2015. Under the revised methodology, the Official Charts Company takes the 12 most streamed tracks from one album, with the top-two songs being down-weighted in line with the average of the rest. The total of these streams is divided by 1000 and added to the pure sales of the album. This calculation was designed to ensure that the chart rundown continues to reflect the popularity of the albums themselves, rather than just the performance of one or two smash hit singles. The final number one album on the UK Albums Chart to be based purely on sales alone was "Smoke + Mirrors" by Imagine Dragons. On 1 March 2015, "In the Lonely Hour" by Sam Smith became the first album to top the new streaming-incorporated Official Albums Chart.