In previous centuries, many families were shattered by early deaths or desertion, so that one-parent and step-families were by no means rare. However, the increase in divorce and the ease with which people cohabit and then separate has led to a change in the proportions of types of families with dependent children. In 2011 about 62% were headed by a married couple or civil partnership, 24% by a lone parent, 14% by a cohabiting couple and a tiny proportion by a same-sex couple. The average number of children in each type was two.