The recent increase in support for Catalan independence has its roots in a Constitutional Court ruling in 2010, which struck down parts of the regional 2006 Statute of Autonomy that granted new powers of self-rule to the region. The ruling came after four years of deliberation concerning a constitutional appeal filed by the conservative People's Party (PP) under Mariano Rajoy—then the country's second-largest party, in opposition to the government of José Luis Rodríguez Zapatero's Spanish Socialist Workers' Party—and was met with anger and street protests in Catalonia. Shortly afterward the PP took power in Spain, and after a massive independence demonstration took place in Barcelona on 11 September 2012—Catalonia's National Day—the Catalan government under Artur Mas called a snap regional election and set out to initiate Catalonia's process towards independence.