Here is a rough summary:
Below two percent Muslims are well-behaved citizens and cause little apparent trouble for the host society.
At two percent and three percent Muslims begin to proselytize from other ethnic minorities and disaffected groups with major recruiting from the jails and among street gangs.
From five percent on Muslims exercise an inordinate influence in proportion to their percentage of the population. They push for the introduction of halal (”clean” by Islamic standards) food, thereby securing food preparation jobs for Muslims. They increase pressure on supermarket chains to feature it on their shelves—along with threats for failure to comply (United States, Switzerland, Sweden). At this point, Muslims work to get the ruling government to allow them to rule themselves under Sharia, or Islamic law. (England, Netherlands, Philippines).
When Muslims reach 10 percent of the population, they increase lawlessness as a means of complaint about their conditions (Paris—car burning). Any non-Muslim action that offends Islam will result in uprisings and threats (Amsterdam, Denmark—Mohammed cartoons, murder of Theo van Gogh).
After reaching 20 percent of a population expect hair-trigger rioting, Jihad militia formations, sporadic killings and church and synagogue burning (Indonesia, Ethiopia).
After 40 percent you find widespread massacres, chronic terror attacks and ongoing militia warfare (Bosnia, Chad).
From 60 percent you may expect unfettered persecution of non-believers and other religions, sporadic ethnic cleansing (genocide), use of Sharia Law as a weapon and jizya, the tax placed on [conquered] infidels (Sudan, Albania).
After 80 percent, expect to find state-run ethnic cleansing and genocide (Syria, Egypt, UAE).