It just happens to mostly sell in South America.
Brazil to be specific, around 400,000 an issue, though a recent "kiss" cover issue saw it sell half a million a couple of years ago. An animated version airs on the Brazilian Cartoon Network. And yes, it's about Monica. And her gang of friends.
But it seems that the publisher, Mauricio de Sousa Producoes, is looking… northwards.
Downloadable computer programs and games
Comic books; children's activity books; posters; hardcover books, 3D books, and manuals all in the field of animation, comics, and storytelling; greeting cards; diaries; calendars; rubber stamps
Indoor and outdoor clothes, namely, dresses, shirts, sweatshirts, sweaters, jackets, sweatpants, playsuits, pajamas, pants, overalls, shorts, gloves, mittens, snowsuits, suspenders, and Halloween costumes; socks; underwear; hats; footwear; hosiery; swimwear
Indoor and outdoor toys, namely, play blocks, balloons, bath tub toys, marbles, slumber and play tents, puppets, model train sets, skateboards, roller skates, water squirting toys, wind-up, pull-back and friction powered figurines, toy vehicles, kites, playground and sports balls, disc toss toys, yo-yos, horse shoes for recreational purposes, paddle ball, badminton sets, play bowling games, ride-on toys, pedal cars, swimming aids, namely, swim rings for recreational use, inflatable and play swimming pools for recreational use, surf boards, play houses, jigsaw, cube and manipulative puzzles, chess sets, hand-held electronic games, throw target games, play three-dimensional viewers and projectors, play kitchen and baker's toys, board games, trading, playing and flash cards; dolls; plush toys
Entertainment services, namely, production of animated motion pictures and animated television series; Games accessible online via a computer network (non-downloadable)