I just did a search of the words, “percentage of chareidim in Jerusalem” and I came up with an article in the JP which said:
“Among the Jews residing in the city, 32% defined themselves as ultra-Orthodox, 17% as religious, 13% as traditional- religious, 15% are traditional but not very religious and 21% defined themselves as secular.”
Apparently there are almost twice as many Chareidim in Yerushalayim as Dati-Leumi.
Also, according to an article in YWN http://www.theyeshivaworld.com/news/headlines-breaking-stories/457459/78-percent-of-jerusalems-students-are-chareidi-or-arab.html
there are a lot more Chareidi students than Dati Leumi students in Yerushalayim. Aside from the Chareidi population, you also have to take into account all of the Chareidi Yeshiva Bochurim who come from all parts of the Country and from Chutz L’Aretz.