JERUSALEM

ISRAEL is facing a challenge it never expected when it captured East Jerusalem and reunited the city in the 1967 war: each year, Jerusalem’s population is becoming more Arab and less Jewish.

For four decades, Israel has pushed to build and expand Jewish neighborhoods, while trying to restrict the growth in Arab parts of the city. Yet two trends are unchanged: Jews moving out of Jerusalem have outnumbered those moving in for 27 of the last 29 years. And the Palestinian growth rate has been high.

In a 1967 census taken shortly after the war, the population of Jerusalem was 74 percent Jewish and 26 percent Arab. Today, the city is 66 percent Jewish and 34 percent Arab, with the gap narrowing by about 1 percentage point a year, according to the Jerusalem Institute for Israel Studies.

Jerusalem’s profound religious and historical significance makes its status perhaps the single most explosive issue in the Arab-Israeli conflict. And that status clearly would become even more contentious were the balance of the population to tip toward the Arabs. This is a specter that worries Israelis, even as the 40th anniversary of their victory in the June 1967 war approaches.