Affiliation is widespread among public-sector employees: averaging almost 88% for pension systems and a little over 90% for health systems, and these figures are relatively similar to those recorded in 2002 (albeit seven percentage points higher in both cases). Among wage earners employed in the private sector by small, medium-sized or large enterprises, affiliation falls to 66% in the case of pension systems and 73% in the case of health systems, although with some improvement between 2002 and 2011. Even lower levels were recorded among wage earners employed by microenterprises (20% and 39%, respectively), with no significant improvement between 2002 and 2011.