Getting only the files from the last x years

[LUNM]

Hello,

I have a folder with a bunch of flat files that were extracted every month for the past ten years, so 120 files. However, I want to be able to get only the files from the past five years. The date is in all the filenames. This is what I did :

#"Custom Column added" = Table.AddColumn(Source, "Custom", each Number.FromText(Text.Range([Name],0,4))),
#"Custom Column added1" = Table.AddColumn(#"Custom Column added", "Custom.1", each if [Custom] >= List.Max(#"Custom Column added"[Custom])-4 then 1 else 0),
#"Filtered Rows" = Table.SelectRows(#"Custom Column added1", each ([Personnalisé.1] = 1)),

However, the files are all loaded everytime I duplicate the table which takes an enormous amount of time. Is there a better option that optimizes performance?

Thanks in advance,

ETA: Here's a sample of the data in Power Query

Content	Name	Extension	Date accessed	Date modified	Date created	Attributes	Folder Path	Custom	Custom.1
Binary	2020-11-30 TX_[...].xlsx	.xlsx	2022-05-30 11:13:23	2022-05-30 11:13:23	2022-05-30 11:13:24	Record	C:\[...]	2020	1
Binary	2015-11-30 TX_[...].xlsx	.xlsx	2020-05-30 11:13:23	2020-05-30 11:13:23	2020-05-30 11:13:23	Record	C:\[...]	2015	0

LUNM