BELGIUM: 9 percent wage gap. One of Europe’s smallest countries also boasts the developed world’s lowest wage disparity. About 56 percent of women aged 15 to 64 in Belgium are employed, earning an average $36,600. European Union Commission President Jose Manuel Barroso (l.) holds a joint press conference with EU Commissioner for Justice, Fundamental Rights and Citizenship Viviane Reding (r.) in Brussels. Ahead of International Women's Day, the European Commission strengthened and deepened its commitment to equality between women and men with a Women's Charter.