a drop in market volume of c. 5.4%

[Анна Ф]

• In 2008 the Russian business achieved a market share of 38.3% (37.6% in 2007) in an overall flat market. In the fourth quarter Baltika again outperformed the market, achieving flat volumes despite a drop in market volume of c. 5.4% and once more demonstrating superior execution power in a tougher trading environment.

Что такое с. ?
cumulative?

[AlexPozd]

circa

значит "примерно" или "около" по латыне

[Анна Ф]

Спасибо большое!