EduStats

Data compiled by unionstats.com show a dip in teacher union membership over the past 30 years.

In 2013:

•47.7 percent of elementary and middle school teachers were in unions. 
•52.2 percent, secondary school teachers
•17.2 percent, pre-school and kindergarten teachers,

In 1983:

•57.7 percent of elementary and middle school teachers were in unions.
•57.4 percent, secondary school teachers
•26.3 percent , pre-school and kindergarten teachers

A recent Gallup poll also showed public opinion waning.

•In 2011, 47 percent of Americans thought teachers unions hurt the quality of public education. That percentage grew from 1976, when 38 percent of Americans thought teachers unions hurt education.