A 2001 study showed that 44 of the U.S. corporations in the top 200 list failed to pay the full 35 percent standard corporate tax rate from 1996 to 1998. In 1998, seven companies—General Motors, Texaco, Chevron, Pepsi, Enron, Worldcom and McKesson—actually received rebates for taxes paid. Despite their market share and continuing growth, the top 200 companies employ only a fraction of the world's workers. In 1999, they employed 0.78 percent of the world's work force, compared with their 27 percent share of world economic activity. And while corporate profits grew 362.4 percent between 1983 and 1999, the number of people employed by these same companies only increased by 14.4 percent.