1-3% does not pass the sniff test. Way too high.
A quick search gives the number 0.6% according to a 2016 study.
A quick search gives the number 0.6% according to a 2016 study.
I've seen the numbers that range from ~1% (or a little under) to as much as 3%, like the study above.
The original comment above stated "trans", though, not T+GNC.