represented by a union
... that the number of employees in the US represented by a union is rising while the proportion of workers represented by a union is decreasing?
... that the number of employees in the US <b id="mwBEo"><a href="./Unionization" id="mwBEs" rel="mw:WikiLink" title="Unionization">represented by a union</a></b> is rising while the proportion of workers represented by a union is decreasing?