wife stories

What Percentage of Married couples really swing?

We are a couple that has tried swinging to put fizz in ou marriage.

We have had a few swaps with other couple and also
had a few MFM threesomes. We liked both variety, but
both of us loved MFM thresomes more.

Browsing the NET, one gets the impression that almost all
couples
experiment with 3sums & 4sums. We would like to know
what is the percentage of couples that actually swing
or have sexual adventures to fulfil their fantasies?

Somewhere we read that about 30% of couples do try
sexual adventures like swapping or threesomes.
Even if it just once.

We are not refering to the frequency of the act.
But we would like to how many of the couples
do it just once or twice for fun or occasionally.

Would that figure be true?