question: What is the number of final position-tours Mariano Piccoli, who has more than 20 final position-giros, before 1999 has?
answer: SELECT COUNT(final_position___tour) FROM table_name_95 WHERE final_position___giro > 20 AND rider = "mariano piccoli" AND year < 1999
context: CREATE TABLE table_name_95 (final_position___tour VARCHAR, year VARCHAR, final_position___giro VARCHAR, rider VARCHAR)