For example, Bulgaria's share of unofficial economic activity compared to official GDP in 1995 is estimated by Lacko (1999) at either 34 per cent or 56.7 per cent, according to the type of method used.
Na primer, udeo bugarske sive ekonomije u odnosu na zvanični BDP 1995. godine Lacko je 1999. procenio na 34, odnosno 56,7 procenata, u zavisnosti od korišćenog metoda.