Employment of mothers with children under 1 year old, 1997-2000 Percent 1997 1998 1999 2000 Total mothers 53.4 53.6 52.7 51.0 Married, spouse present 56.3 55.2 53.7 51.1 Unmarried mothers 43.4 48.4 49.5 50.7 Note: "Unmarried mothers" include never-married, divorced, separated, and widowed mothers.