Table 2.--Synthetic and natural sodium sulfate1/ produced in the United States (Thousand metric tons and thousand dollars) ----------------------------------------------------------------------------------------------------- Synthetic and natural2/ (quantity) Natural -------------------------------------- --------------------- Year Lower purity3/ High Synthetic (99% or less) purity Total4/ (quantity) Quantity Value ----------------------------------------------------------------------------------------------------- 1970--------------- 509 737 1,246 703 543 10,932 1971--------------- 466 765 1,231 607 624 11,008 1972--------------- 477 727 1,204 568 636 11,396 1973--------------- 481 824 1,305 695 610 11,597 1974--------------- 513 710 1,223 602 621 16,411 1975--------------- 391 722 1,113 508 605 27,667 1976--------------- 422 695 1,117 516 601 32,655 1977--------------- 614 474 1,088 511 577 29,313 1978--------------- 599 461 1,060 511 549 27,865 1979--------------- 555 462 1,017 533 484 29,689 1980--------------- 613 421 1,033 504 529 36,389 1981--------------- 604 404 1,008 456 552 43,186 1982--------------- 420 364 784 W W W 1983--------------- 418 411 829 445 384 39,425 1984--------------- 386 431 817 422 395 40,125 1985--------------- 340 396 736 383 353 35,860 1986--------------- 328 435 763 404 359 34,102 1987--------------- 312 414 725 379 346 33,086 1988--------------- 312 431 743 382 361 31,377 1989--------------- 291 394 685 345 340 31,104 1990--------------- 305 360 665 364 349 33,748 ----------------------------------------------------------------------------------------------------- W Withheld. 1/All quantities converted to 100% Na2SO4 basis. 2/Current Industrial Reports, Inorganic Chemicals, Bureau of the Census. Revisions from 1988 Annual (Preliminary), MA28A, Nov. 1989, p. 11. 3/Includes Glauber's salt. 4/Data may not add to totals shown because of independent rounding.