ISO 9000 number of certified Bulgarian companies during the years:
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Certified companies assorted in different
branches:
| Construction /EAC Code 28/ |  1197 |
| Wholesale and retail trade; Repair of motor vehicles, motorcycles and personal and household goods /EAC Code 29/ | 1166 |
| Other Services /EAC Code 35/ | 800 |
| Electrical and optical equipment /EAC Code 19/ | 534 |
| Basic metals and fabricated metal products /EAC Code 17/ | 477 |
| Machinery and equipment /EAC Code 18/ | 407 |
| Engineering services /EAC Code 34/ | 314 |
| Transport, storage and communication /EAC Code 31/ | 249 |
| Rubber and plastic products /EAC Code 14/ | 239 |
| Food products, beverages and tobacco /EAC Code 3/ | 238 |
| Information technology /EAC Code 33/ | 220 |
| Public administration /EAC Code 36/ | 155 |
| Concrete, cement, lime, plaster etc /EAC Code 16/ | 137 |
| Chemicals, chemical products and fibres /EAC Code 12/ | 122 |
| Textiles and textile products /EAC Code 4/ | 105 |
| Health and social work /EAC Code 38/ | 79 |
| Manufacturing not elsewhere classified /EAC Code 23/ | 73 |
| Printing companies /EAC Code 9/ | 66 |
| Wood and wood products /EAC Code 6/ | 66 |
| Hotels and restaurants /EAC Code 30/ | 66 |
| Non-metallic mineral products /EAC Code 15/ | 64 |
| Education /EAC Code 37/ | 61 |
| Other social services /EAC Code 39/ | 50 |
| Agriculture, fishing /EAC Code 1/ | 42 |
| Others transport equipment /EAC Code 22/ | 41 |
| Pulp, paper and paper products /EAC Code 7/ | 38 |
| Mining and quarrying /EAC Code 2/ | 35 |
| Financial intermediation; real estate; renting /EAC Code 32/ | 33 |
| Shipbuilding /EAC Code 20/ | 28 |
| Electricity supply /EAC Code 25/ | 28 |
| Pharmaceuticals /EAC Code 13/ | 26 |
| Leather and leather products /EAC Code 5/ | 19 |
| Publishing companies /EAC Code 8/ | 13 |
| Manufacture of coke and refined petroleum products /EAC Code 10/ | 10 |
| Gas supply /EAC Code 26/ | 9 |
| Water supply /EAC Code 27/ | 7 |
| Recycling /EAC Code 24/ | 6 |
| Aerospace /EAC Code 21/ | 4 |
| Nuclear fuel /EAC Code 11/ | 1 |