In 2003, about half of school-age students with disabilities spent most of their school day in classrooms with their typically developing peers. By 2013, that number had risen to 61 percent.
At least part of that change can be tied to wider use of co-teaching, an instructional method that pairs a general and a special education teacher in the same classroom. Co-teaching is meant to provide specialized services to students with disabilities in regular classrooms, while ensuring they also get access to the same academic material as their peers. See the full article here