CSD Policy Brief No. 43, Korupcija i antikorupcija v Bălgarija (2012 - 2013 g.) (Centăr za izsledvane na demokracijata, 2013)
The corruption trends indices for Bulgaria in 2013 are calculated through the Corruption Monitoring System (CMS) developed by the Center for the Study of Democracy and Vitosha Research. The results show that administrative corruption among the population in Bulgaria over the past two years remains practically unchanged. On average, over the period 2012 - 2013, 14% of the adult population has been involved in corruption transactions at least once per year