Sadio Mane and Pierre-Emerick Aubameyang scored final-day goals to share the Golden Boot with Mohamed Salah.
Salah also won the prize last season.
It is the lowest winning total since 2010-11, when Dimitar Berbatov and Carlos Tevez shared the Golden Boot with 20 goals each.
Salah, 26, scored 32 goals last term. That figure is the record for the most goals scored in a 38-game campaign.
He becomes the sixth player to win the award in consecutive seasons.
Tottenham's Harry Kane, the last player to retain the Premier League Golden Boot, having won it in 2015-16 and 2016-17, finished on 17 goals following a campaign blighted by injury.