0. Farmers
10. Paid farm workers
21. Industrial workers
22. Artisans
23. Fishers
26. Wholesale merchants
27. Smaller merchants
30. Free-market professions
32. Professors, literary and scientific professions
33. Engineers
34. Administrative executives
41. Instructors, diverse intellectual professions
42. Medical and social services
43. Technicians
44. Administrative secretaries
51. Office employees
53. Business employees
60. Supervisors
61. Skilled workers
63. Specialized workers
65. Miners
66. Mariners and fishers
67. Apprenticed workers
68. Laborers
70. Servants
71. Housewives
72. Other service personnel
80. Artists
81. Clergy
82. Army and police
91. Students
92. Soldiers of the contingent
93. Former farmers (farms and workers)
94. Retired from business
95. Retired from the public sector
96. Former workers of the private sector
99. Other nonactive people (includes persons age 14 or less)