All, 225,000 of the Arab population are East Jerusalem Arabs. Most likely, this will not be included in a final settlement as part of Israel. Consequently, the Arab percentage is closer to 17.5%. The Christians and others include Druzim, Bahais, Russians, Asian Guest workers, etc. These are not Arabs.
U.S. confirms ISIS computer expert killed in air strike (Reuters)
from the article: Israel closes decade with population of 7.5 million