Thatcher reformed local government taxes by replacing domestic rates (a tax based on the nominal rental value of a home) with the Community Charge (or poll tax) in which the same amount was charged to each adult resident. The new tax was introduced in Scotland in 1989 and in England and Wales the following year, and proved to be among the most unpopular policies of her premiership. Public disquiet culminated in a 70,000 to 200,000-strong demonstration in London in March 1990; the demonstration around Trafalgar Square deteriorated into riots, leaving 113 people injured and 340 under arrest. The Community Charge was abolished in 1991 by her successor, John Major. It has since transpired that Thatcher herself had failed to register for the tax, and was threatened with financial penalties if she did not return her form.