Conversation so far:
When did Sakis first start experiencing success?
made his first professional appearance in 1991 at the Show Centre.
Did he have any hits during this early period?
"Par'ta" became a radio hit, and other songs of the album such as "1992", "Ego S'agapo" ("I Love You") and "Gia Fantasou" ("Imagine") also became popular.
What kinds of performing did he do besides singing?
CANNOTANSWER.
Did Sakis collaborate with anyone during his early success?
CANNOTANSWER.

Question: How many albums did he release during this period?
Self-contained rewrite: How many albums did Sakis release during when during the period of early success?