The BG40 index of the most traded stocks on the Bulgarian Stock Exchange (BSE) has lost 76.86% of its value since the start of the year, Profit.bg data show.

The index has dropped by an average of 1.67% every week, which represents the weekly loss of investors on BSE this year.

The index dropped by more than 10% in six weeks in 2008 and record loss of 18% was posted in the week October 6-10.

Last week the BG40 recorded its second biggest weekly drop this year after it lost 17.76% in the five sessions between November 10 and 14.

The index has advanced in 15 of the 46 weeks since the start of the year, while the record gain of 9.40% was posted in the period October 20 to 24.

BG 40 is calculated as its base value is multiplied by the ratio between the sum of the adjusted by the divisor of each company prices of last trades in the shares, included in the index at the current moment, and the sum of the prices of last trades in the shares of the companies at the base moment, and the result then is multiplied by the index base adjustment factor.

If there is no transaction in shares of a certain company during a trading session, then the price of the last trade in the respective issue shall be taken into consideration for the purposes of the index.

When calculating the index, only the prices of trades executed during the continuous trading on the Exchange by matching asks and bids or market-maker quotations are be taken into consideration.