Dataflow Datestamp

Hi, 

I have a dataflow which pulls the following data: 

Rem. House Purchase. Advance

2% 6% 2%

The problem that I have is that it doesn'thave a date stamp so when I run it today and then tomorrow, I'll have 1 row of data but the values could change. 

What I want is to keep today's values and add a date it was updated and then tomorrow, the values append yesterday's so it would look something like this:

Rem. House Purchase. Advance. Date

2% 6% 2% 15/05/24

3% 5% 2% 16/05/24

Is there anyway of doing this please?