According to the preliminary data of the NSI, in January 2012, the index of production in the Construction sector, calculated on the base of seasonally adjusted data, was 1.8% below the level of the previous month.

The preliminary data was released by the Bulgarian National Statistics Institute, NSI.

In January 2012, the work day adjusted data showed an increase by 0.2% in the construction production, compared to the same month of 2011.

By preliminary seasonally adjusted data of NSI in January 2012, the turnover in Retail Trade, except of motor vehicles and motorcycles at constant prices decreased by 0.2% compared to the previous month.

In January 2012 the working day adjusted turnover in Retail trade, except of motor vehicles and motorcycles, declined by 2.6% in comparison with the same month of the previous year.

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.