Compare 4 previous fiscal year cost with current Fiscal year cost in line chart

[ganes]

How to compare previous Fiscal years cost with current fiscal year in a line chart? Fiscal year starts from Feb 01 and ends in jan 31. I have added 4 colums for this but it is taking long time to load as its direct query from bigquery and table is 600GB. I wanted to know optimized solution. 
My chart is currently looking like this 

but i want in the below format

[lbendlin]

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