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A recent study asserts that listening to pop music such as Taylor Swift's "Shake It Off" can help reduce post-surgery pain in children. (Wally Skalij/Los Angeles Times/TNS) Image Credit: MCT

There is no knocking Taylor Swift from her perch at the top of the weekly US Billboard 200 chart, where her album 1989 notched its ninth week at No. 1.

1989 sold 111,000 album copies and 439,000 individual song downloads, bringing her total tally to 155,000 units sold for the week ending January 11, according to figures released on Wednesday by Nielsen SoundScan.

It is the album’s ninth non-consecutive week at the top of the chart in the 11 weeks since release. In the last week of 2014, 1989 surged ahead of the Frozen soundtrack to become the year’s biggest seller.

In the revamped Billboard 200 chart guidelines, 10 song sales equal one album unit, and 1,500 album streams equal one album unit. Swift famously opted out of streaming 1989 and the rest of her catalogue on popular online platform Spotify.

Only one new entry entered the top 10 of the Billboard 200 chart this week, hip hop duo Rae Sremmurd with SremmLife, which came in at No. 5.

British singer Ed Sheeran’s X climbed one rung to No. 2 with 76,000 units 29 weeks after release, while rapper Nicki Minaj’s The Pinkprint dropped down to No. 3 with 60,000 units.

On the digital songs chart, which measures song downloads, Mark Ronson and Bruno Mars’ Uptown Funk! sold 340,000 units for the top spot two weeks running. Taylor’s Blank Space dropped to No. 4 with 176,000 units.