What is the general trends in trade union memebership?

In recent decades, trade union membership has generally experienced a decline in many developed countries, particularly in the United States and parts of Western Europe. This trend is attributed to factors such as globalization, changes in labor markets, and the rise of gig economy jobs that often lack union representation. Conversely, some regions, particularly in emerging economies, have seen an increase in union membership as workers seek collective bargaining power to improve working conditions. Overall, while union membership is declining in some areas, it remains a vital force in advocating for workers' rights in various contexts.