Authorities will also accept alternative documents such as medical records, utility bills or money transfer receipts, recognising that many undocumented migrants work informally and lack standard paperwork. Officials insist the measure simply brings the law into line with reality, acknowledging that many undocumented migrants already contribute to key sectors of the economy. Party figures point out that many undocumented migrants are already working – often without contracts – and say denying them rights benefits only those who profit from precarious labour. Spain has carried out eight extraordinary migrant regularisations since the 1980s, under both socialist and conservative governments. The largest regularisation came in 2005 under José Luis Rodríguez Zapatero, when nearly 578,000 migrants obtained legal papers.