Sumproduct or Sumifs Across Multiple Sheets

[Kerrbear]

Hi, I've read so many threads and can't seem to find examples with similar structure to mine. Need help, please.

I'm trying to sum data across multiple worksheets into a summary where it must match text from the row & the year from the columns and sum the amounts across all worksheets. Showing very simplified version below...

- The worksheets will be numbered 1 through 16 and I have a list named "sheetlist"
- There is a year referenced in row 1 across all worksheets with data, but there may be multiple of same year where the summary will need to consolidate.
- The text in column A will appear once but row may not be inconsistent.

I've tried the sumproduct(sumifs(indirect but can't seem to get it to work.

I have been able to get sumproduct to work across a single worksheet, but not all 16.

Summary sheet:
[TABLE="width: 400"]
<tbody>[TR]
[TD][/TD]
[TD]A[/TD]
[TD]B[/TD]
[TD]C[/TD]
[TD]D[/TD]
[TD]E[/TD]
[/TR]
[TR]
[TD]1[/TD]
[TD][/TD]
[TD]2017[/TD]
[TD]2018[/TD]
[TD]2019[/TD]
[TD]2020[/TD]
[/TR]
[TR]
[TD]2[/TD]
[TD]REVENUE[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]3[/TD]
[TD]COS[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]4[/TD]
[TD]OH[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
</tbody>[/TABLE]

Sample worksheet 1
[TABLE="width: 400"]
<tbody>[TR]
[TD][/TD]
[TD]A[/TD]
[TD]B[/TD]
[TD]C[/TD]
[TD]D[/TD]
[TD]E[/TD]
[/TR]
[TR]
[TD]1[/TD]
[TD][/TD]
[TD]2017[/TD]
[TD]2017[/TD]
[TD]2017[/TD]
[TD]2018[/TD]
[/TR]
[TR]
[TD]2[/TD]
[TD]REVENUE[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]3[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]4[/TD]
[TD]COS[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]5[/TD]
[TD]OH[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
</tbody>[/TABLE]

Sample worksheet 2
[TABLE="width: 400"]
<tbody>[TR]
[TD][/TD]
[TD]A[/TD]
[TD]B[/TD]
[TD]C[/TD]
[TD]D[/TD]
[TD]E[/TD]
[/TR]
[TR]
[TD]1[/TD]
[TD][/TD]
[TD]2017[/TD]
[TD]2018[/TD]
[TD]2018[/TD]
[TD]2018[/TD]
[/TR]
[TR]
[TD]2[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]3[/TD]
[TD]REVENUE[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]4[/TD]
[TD]COS[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]5[/TD]
[TD]OH[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
</tbody>[/TABLE]