By the 1990s crime rates started to drop dramatically due to revised police strategies, improving economic opportunities, gentrification, and new residents, both American transplants and new immigrants from Asia and Latin America. Murder rates that had reached 2,245 in 1990 plummeted to 537 by 2008, and the crack epidemic and its associated drug-related violence came under greater control. The outflow of population turned around, as the city once again became the destination of immigrants from around the world, joining with low interest rates and Wall Street bonuses to fuel the growth of the real estate market. Important new sectors, such as Silicon Alley, emerged in Manhattan's economy.