It's a good deal more than 0.6% at Google, fyi. And the toilets in question aren't stall toilets, they're room toilets, like you'd see in a smaller restaurant.
In fact - it's considerably less than 0.6% in real life.
The manner in which they calculate 'non gender binary' is really, really soft - i.e. 'if don't feel entirely male or female' you can often be included in that group.
Hell, I'm a pretty straight white dude, but I don't feel 'fully male' 100% of the time!
Moreover - most trans people are actually still 'binary' - they still identify as one or the other.
I'm inclined to agree that Google has more of share of people who are not binary, but in reality, the number is really, really small. Much smaller than 0.6%.
