However, other sources have published different estimates.

Many companies are tracked by financial analysts that publish estimates of earnings per share.

This process of gathering data is only complicated by the fact that very few countries publish national estimates of child trafficking.

The failure to meet forecasts was the first since the company began publishing such estimates two years ago, and its stock fell 8 percent in London.

The issue is particularly acute for property companies because they publish regular estimates of what their buildings should be worth on the open market.

Richard Pankhurst has published estimates of the number of people sold in this market during the 19th century that range between 10,000 and 20,000.

Since then the government has only published rough estimates of the population.

He said his "usual checks" were with several market-data firms that publish estimates on quarterly shipments of personal computers.

On Friday, the Government will publish preliminary estimates of the economy's performance last year.

Gartner publishes estimates, but the way the estimates are calculated is not openly published.