Assuming by Line Series Visual that you mean a Line Chart? If so then see below:
I have loaded your data into a table, with the percentages as decimals, eg 99% = 0.99. I have then formatted the column as Percent from the Modelling Ribbon.
Create a Line Chart visual and assign as follows:
Axis = Year
Legend = Dept
Values = Percentages
To add a Trend Line, go to the Analytics tab of the Line Chart and add a Trend Line. Take note of the option 'Combine Series'. If selected, the trend line will sit between your two Departments, as per below, else you will get a trend line per Department: