I want to know the answer to the following question:
What percentage write it?
All the background I'm provided with is that "The first two numbers (understanding and speaking) remain roughly the same as a decade earlier; the latter two (reading and writing) both show enormous gains: a decade earlier, only 49.3 percent of the population could read Galician, and only 34.85 percent could write it.". Is that enough to answer the question?
Answer: no