Plot time series with years in different columns

I have the following data frame dt(head,6):

I need to create a graph in which I have the years (2015, 2016, 2017, 2018, 2019) on the x-axis , different columns (W15, W16, W17, W18, W19 - each one relates to one year) on the y-axis. They are all should be grouped by the column TEAM.

I tried using ggplot2 to no avail.