Sivan only had two other Top 40 singles before `` 1999 '' reached number 13 on the UK Singles Chart .
The track has reached number 13 on the UK Singles Chart chart issue dated 22 November 2018 , becoming Charli XCX 's tenth Top 40 single and also her first Top 20 single since 2015 and Sivan 's third Top 40 single and also his first Top 20 single .