Preliminary data released by the Bulgarian National Statistics Institute, NSI, showed that Bulgaria's seasonally adjusted Industrial Production Index decreased by 0.4% in November 2011, as compared to October 2011.

In November 2011, work day adjusted Industrial Production Index rose by 0.6% as compared to the same month of 2010.

In November 2011, compared to October 2011, the seasonally adjusted Industrial Production Index in the mining and quarrying industry decreased by 13.6%, in the manufacturing - by 1.5%, while in the electricity, gas, steam and air conditioning supply increased by 1.9%.

The most significant decreases of production in the manufacturing were seen in the manufacture of fabricated metal products, except machinery and equipment by 10.7%, in the manufacture of rubber and plastic products by 8.1%, in the manufacture of beverages by 7.2%, in the manufacture of paper and paper products by 6.0%, in the manufacture of wearing apparel by 3.9%. There was increase in the repair and installation of machinery and equipment by 15.5%, in the manufacture of tobacco products by 14.4%, in the manufacture of electrical equipment by 8.2%.

On annual basis, in November 2011, the Industrial Production Index, calculated from work day adjusted data in the electricity, gas, steam and air conditioning supply grew by 10.5%, while in the mining and quarrying industry the production decreased by 7.5% and in the manufacturing by 1.5%.

Increases were registered in the production of investment goods by 7.8% and in the production of energy by 5.0%, while in the production of intermediate goods a decrease by 2.6% was seen.

According to the preliminary data of the NSI, in November 2011, the index of production in the Construction sector, calculated on the base of seasonally adjusted data, was 0.4% below the level of the previous month.

In November 2011, the work day adjusted dat4 showed a decrease by 10.3% in the construction production, comparing to the same month of 2010.

In November 2011, the construction production was below the level of the previous month. The Index of Production of building construction, calculated from the seasonally adjusted data, showed a decrease by 0.7%, while the production of civil engineering rose by 0.3%.

On an annual basis, in November 2011, the decrease of production in construction, calculated from working day adjusted data was determined mainly from the drop by 16.3% in the civil engineering, while the building construction decreased by 5.2 %.

By preliminary seasonally adjusted data of NSI, in November 2011, the turnover in retail trade, except of motor vehicles and motorcycles at constant prices fell by 0.6% compared to the previous month.

In November 2011, the work day adjusted turnover in retail trade, except of motor vehicles and motorcycles declined by 5.3% in comparison with the same month of the previous year.

In November 2011, compared to the previous month the turnover increased in the retail sale of automotive fuel by 2.1% and in the dispensing of chemicals; retail sale of medical and orthopedic goods, cosmetic and toilet articles by 1.7%. A decrease was observed in the retail sale of textiles, clothing, footwear and leather goods' - by 10.4%, in the retail sale of audio and video equipment; hardware, paints and glass; electrical household appliances - by 2.1%, in the retail sale of computers, peripheral units and software; telecommunications equipment - by 2.1% and in the retail sale of food, beverages and tobacco - by 0.6%.

In November 2011, compared to the same month of 2010, the turnover grew in the dispensing of chemicals; retail sale of medical and orthopedic goods, cosmetic and toilet articles by 8.3%. A drop was registered in the retail sale of audio and video equipment; hardware, paints and glass; electrical household appliances - by 14.2%, in the retail sale of computers, peripheral units and software; telecommunications equipment - by 13.4%, in the retail sale of textiles, clothing, footwear and leather goods - by 11.2%, in the retail sale of food, beverages and tobacco - by 2.6% and in the retail sale of automotive fuel - by 0.9%.

Seasonal adjustment is a statistical method, which eliminates the seasonal component of time series and it is particularly suitable for long-term comparisons and analysis of the data.

Work day adjustment is an adjustment for variations in monthly data, caused by calendar effects, different number of calendar and work days in the month, and national holydays - for example the presence of more days off in May could contribute to the decline in the production in some activities.