Page 9 here, in Greek. These are the result of a poll conducted by VPRC a social and political polling company a month ago...
I translate:

What is the percentage of income loss from all sources that your household has suffered compared to last year (twelve months ago)
(Among those who have stated that their personal economic situation has improved - [which is 89% according to the previous slide])

Average reported reduction of income loss over the past year - 46,3%.

So no datasets, but that's a reputable research company...

The road of excess leads to the palace of wisdom - William Blake