 Complete the following phrase:  The 2010 Catalan autonomy protest was a demonstration in central Barcelona on 10 July 2010 against limitations of the autonomy of Catalonia, and particularly against a recent decision of the Spanish Constitutional Court to annul or reinterpret several articles of the 2006 Statute of Autonomy of Catalonia. The number of people taking part in the demonstration was estimated at between 1.1 million according to the local police and 1.5 million according to the organisers, while Madrid-based newspaper El País estimated the number of demonstrators at 425,000. The mobilisation was described as unprecedented by the mayor of Barcelona. The Barcelona daily newspaper El Periódico de Catalunya described it as without a doubt one of the biggest protest marches that has ever occurred in Catalonia, possibly the biggest. It is thought that the 