Employment in largest occupations, 1988 and 2000 (projected and actual) Millions 1988 Projected 2000 2000 Retail salespersons 3.834 4.564 4.223 General managers and top executives 3.030 3.509 3.539 Janitors and cleaners 2.895 3.450 3.300 Cashiers 2.310 2.614 3.289 Office clerks, general 2.519 2.974 3.192 Truckdrivers, light and heavy 2.399 2.768 3.072 Secretaries, except legal and medical 2.903 3.288 2.845