Demographics of Preachers

Because Richard Allen is quoted as saying there was "no colored preacher in Philadelphia but myself," (Dickerson) I am curious about the changing landscape of preachers around this time. Did Allen really mean he was the only black preacher, or that he was the only black Methodist preacher? How common were black preachers by the time Jarena Lee was permitted to preach? Did more black women (and white women for that matter) join the fold of preachers immediately after Jarena Lee, or was she a unique case?