Comparison between the long-term temporal evolution of the normalised flux for the major magnetar outbursts that occurred up to the end of 2016 with the outburst of Sw J1555 in red. The data are from the Magnetar Outburst Online Catalog (Coti Zelati et al. 2018). For SGR J1745−2900, we included the latest observations presented by Rea et al. 2020. The outbursts highlighted in colour are those showing a substantial and fast decay of the flux in the final phase, as observed for Sw J1555.