In July 2006 a Florida Government Laptop was missing from the Government Vehicle of a special agent for the Department of transportation. Gone is the sensitive personal information of 133,000 Floridians. http://www.washingtonpost.com/wp-dyn/content/article/2006/08/09/AR2006080901177.html
In September 2006 it was estimated that 250 LapTop computers disappeared of the Census Bureau containing names, incomes and social security numbers. http://www.washingtonpost.com/wp-dyn/content/article/2006/09/21/AR2006092101602.html
In June 2006 it was reported that a government IRS laptop also went missing that contained the names, birthdates, social security numbers and finger prints of its employees. http://www.msnbc.msn.com/id/13152636/
In February 2007 a government laptop disappeared. It contain the sensitive information of patients, names, medical data, medical diagnosis, at the National Institute of Health study.
You might think that these are just a few Laptop computers from a few locations with just a few people affected by it, but that would be a lie. First off the total of information stolen, which I listed so far, was more than 100,000 personal data on people. More than 500,000 total. Just the few I listed gives us close to if not over 1000,000,000.
Back in September 2006 there was an article about the numbers of computer laptops that have vanished since 2001. Between 2001 and 2006 the number of laptops was 1,100. http://www.washingtonpost.com/wp-dyn/content/article/2006/09/21/AR2006092101602.html
Since the number of computer laptops was last configure in 2006 there has been quite a few more incidences of stolen government laptops. However the number data of how many is not know since the reporting is not all collected in one place, and most times they consider the computers to be missed placed.