Changes to a field's value

Hello Everyone,

I am wondering if there is a way in Eloqua to find out why a field's value has changed. For instance, we recently ran a campaign and included a few contacts from the United States. At some point before a few form conversions happened, their country value was somehow updated to a blank value. We are curious to know why their country value was updated from United States to a blank value. Is there any way I can fetch this information out of Eloqua?