Earlier this week, the National Alliance for Public Charter Schools (NAPCS) released its annual market share report (PDF). The report shows that charter school enrollment continues to grow rapidly. From 2010-11 to 2011-12, charter school enrollment grew by 13 percent. The report also shows that in many cities, including some of the nation’s largest urban districts, charter schools now enroll more than 20 percent of eligible students. In several cities, including Kansas City, Detroit, and Washington DC more than 35 percent of students are in charters. In New Orleans, where the city’s public education system was rebuilt by charter schools after Hurricane Katrina in 2005, almost 80 percent of students attend these schools. See the NAPCS blog for more on the report’s key findings.