The 2006 Census enumerated 8 896 800 families in Canada. Married couples constituted the largest group (68.6%), although their proportion has been steadily decreasing for the past 20 years. The number of common-law-couple families increased 18.9% between 2001 and 2006, more than five times the 3.5% gain observed for married-couple families and more than double the growth of 7.8% for lone-parent families. Lone-parent families headed by men increased 14.6% during the five years prior to 2006, more than twice the growth of lone-parent families headed by women (6.3%). For the first time in 2006 there were more census families comprised of couples without children (42.7%) than with children (41.4%).