Table 3.--U.S. exports of sodium sulfate
                                           (Thousand metric tons and thousand dollars)
                 -----------------------------------------------------------------------------------------------
                                          Disodium sulfate,       Disodium sulfate,
                                             salt cake1/                other3/                   Total
                         Year           ---------------------   ---------------------   -----------------------
                                         Quantity     Value2/    Quantity     Value2/    Quantity       Value2/
                 -----------------------------------------------------------------------------------------------
                 1970---------------           NA          NA          NA          NA          50         1,668
                 1971---------------           NA          NA          NA          NA          60         1,825
                 1972---------------           NA          NA          NA          NA          26           926
                 1973---------------           NA          NA          NA          NA          41         2,049
                 1974---------------           NA          NA          NA          NA          46         3,250
                 1975---------------           NA          NA          NA          NA          70         6,144
                 1976---------------           52       3,636          NA          NA          52         3,636
                 1977---------------           39       2,801          NA          NA          39         2,801
                 1978---------------           42       2,483          35       2,993          76         5,475
                 1979---------------           73       5,296          20       3,220          93         8,516
                 1980---------------           75       6,593          42       6,147         117        12,740
                 1981---------------           80       7,820          34       5,159         112        12,980
                 1982---------------           64       6,714          36       5,448         101        12,162
                 1983---------------           56       6,960          26       4,420          83        11,380
                 1984---------------           44       5,325          25       4,262          69         9,587
                 1985---------------           96       8,816          12       3,083         108        11,899
                 1986---------------           97       8,218           5       1,965         101        10,183
                 1987---------------           96       8,882          15       1,672         111        10,554
                 1988---------------           62       5,128          15       3,609          77         8,737
                 1989---------------           60       5,409           2         832          62         6,241
                 1990---------------           61       6,092           1         612          62         6,704
                 -----------------------------------------------------------------------------------------------
                   NA  Not available.
                   1/Prior to 1989, salt cake was Schedule B No. 4214200.  In 1989, it was reclassified under the
                 Harmonized Tariff System as HTS No. 2833.11.1000.
                   2/Customs, insurance, and freight (c.i.f.) value at U.S. port.
                   3/Prior to 1989, other sodium sulfate was Schedule B No. 4214500.  In 1989, it is listed as
                 HTS No. 2833.11.5000.

                   Source: Bureau of the Census.