The Holiday singer launched her Rebel Heart shows in Montreal, Canada in September (15), three years after she last hit the road with her MDNA tour.

However, newly-released figures show Madonna's latest trek is struggling to match the box office receipts she scored in 2012 - sales have halved on many stops on the Rebel Heart tour, according to the Boxscore data published by

Madonna brought in around $3.4 million (£2.1 million) for her two nights in Toronto, Canada last month (Oct15), less than half of the $7.5 million (£4.7 million) she made for a pair of shows at the same venue in the city in September, 2012.

The figures also show a Rebel Heart concert at the Boardwalk Hall in Atlantic City, New Jersey on 3 October (15) brought in around 48 per cent less cash than a previous show there on her MDNA tour three years ago.

Madonna's tour has moved to Europe this month (Nov15), with the shows kicking off in Germany on Wednesday night (04Nov15) before planned stops in Sweden, Italy, Spain and the U.K.

The Rebel Heart shows will return to the U.S. in January (16) ahead of the Asian and Australian legs of the tour, which concludes in Brisbane, Australia on 27 March (16).