toward a market-based economic system and Heritage Foundation's Index of Economic Freedom, said "given that the Heritage Foundation has a political agenda, its work should be viewed with caution." In 2002, Heritage began publishing its annual "Index of Dependence" report on federal government programs in five areas (housing; health care and welfare; retirement; higher education; and rural and agricultural services) that, in its view, constrain private sector or local government alternatives and impact the dependence of individuals on the federal government. The 2010 Heritage report concluded that each year the number of Americans who pay nothing in federal personal income taxes had increased, while the number who rely on government services increased. The 2010 report stated that in the previous eight years, the index of government dependence has grown by almost 33 percent. Heritage's conclusions have been questioned; Rex Nutting of MarketWatch wrote in 2012 that the report was "misleading" and "alarmist"; that the percentage of Americans "dependent" upon government had remained essentially the same as it was in the 1980s; and that a small increase was attributable to the Great Recession and an aging population with proportionally more retirees. The Heritage Foundation's blog, The Foundry, was phased out in 2014 and replaced with The Daily Signal. In 2005, Heritage established the Margaret Thatcher Center for Freedom in honor of the former British prime minister. Thatcher herself maintained a long relationship with The Heritage Foundation. Shortly after leaving office, Thatcher was honored by Heritage at a September 1991 dinner. Seven years later, Thatcher delivered the keynote address during Heritage's 25th anniversary celebration. In 2002, Thatcher was again honored by Heritage as the recipient of its annual Clare Boothe Luce Award. In November 2011, the Heritage Foundation and the American Enterprise Institute (AEI) co-hosted a debate among the candidates for the 2012 Republican presidential nomination on foreign policy and national defense. The first presidential debate to be sponsored by either Heritage or AEI, During the debate, Heritage fellows Edwin Meese and David Addington were among the moderators. Conservative commentator Michael Barone praised the debate as "probably the most substantive and serious presidential debate of this election cycle." The Heritage Foundation is an associate member of the State Policy Network. Climate change denial The Heritage Foundation rejects the scientific consensus on climate change. The Heritage Foundation is one of many climate change denial organizations that have been funded by ExxonMobil. The Heritage