Some of the problems of accessing grey literature have decreased since the late 1990s as government, professional, business and university bodies have increasingly published their reports and other official or review documents online. The informal nature of grey literature has meant that it has become more numerous as the technology that allows people to create documentation has improved. Less expensive and more sophisticated printers increased the ease of creating grey literature. And the ability to post documents on the internet has resulted in a tremendous boom. The impact of this trend has been greatly boosted since the early 2000s, as the growth of major search engines has made retrieving grey literature simultaneously easier and more cluttered. Grey reports are thus far more easily found online than they were, often at no cost to access. Most users of reports and other grey documents have migrated to using online copies, and efforts by libraries to collect hard-copy versions have generally declined in consequence.