 The BBC economist Evan Davis however reported prior to the 2007 Scottish Parliament election that the Barnett formula already allows Scotland to sustain higher levels of per capita public spending relative to the rest of the UK, which is approximately equivalent to its disproportionately high annual contribution of tax revenues to the central UK Treasury from Oil production.However Scotland's per capita spending growth, relative to the rest of the UK, has in recent years, been nominally reduced by the operation of the Barnett formula, in order to bring public spending levels into line with the UK average, in a phenomenon that had been dubbed the "Barnett Squeeze".There have been moves to recast the constitutional status of Orkney, Shetland and the Western Isles partly in order to get a greater share of the oil revenues to these islands, in whose maritime territory it is argued that most of the oil is found.