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| Total U.S. retail sales of energy supplements, at current and constant prices, 1997-2001 | Year | Sales at current prices | | Sales at constant 2001 prices | | | US$m | % change | US$m | % change | 1997 | 517 | - | 569 | - | 1998 | 656 | 27.0 | 707 | 24.3 | 1999 | 812 | 23.8 | 857 | 21.2 | 2000 | 1,000 | 23.1 | 1,031 | 20.3 | 2001 | 1,235 | 23.5 | 1,235 | 19.8 | Source: IRI/ Mintel | |