. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. 1966 1970 1972 1974 1S76 1876 1960 1962 1964 1966 1966 âoâ 20 27 ââ¢â 34 â*â 3S â'â Total Figure 1. Number of manufacturing firms, select SICs and total. Although the number of manufacturing firms has changed only slighdy, the number of manufacturing employees has changed significantly. Statewide, the number of individuals employed by the manufactur- ing sector in 1989 was 27% less than the number e
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. 1966 1970 1972 1974 1S76 1876 1960 1962 1964 1966 1966 âoâ 20 27 ââ¢â 34 â*â 3S â'â Total Figure 1. Number of manufacturing firms, select SICs and total. Although the number of manufacturing firms has changed only slighdy, the number of manufacturing employees has changed significantly. Statewide, the number of individuals employed by the manufactur- ing sector in 1989 was 27% less than the number employed in 1968, from million to million (Figure 2). Employment in the three largest SICs in 1968, SIC 34 (fabricated metal products), 35 (ma- chinery), and 36 (electric and electronic equipment), declined 25, 33 and 46 percent 1968 1970 1972 1974 1976 1978 1960 1982 1964 1966 1968 Iâ 34 ââ¢â 35 â»â 36 ââ â State Total Figure 2. Number of manufacturing employees, select SICs and total. ' "The Standard Industrial Classificaiion (SIC) is the statistical classification standard underlying all establishment-based Federal economic statistics classified by ;(OMB 1987, p3). "The SIC was developed for use in the classification of establishments by type of activity in which they are engaged; for purposes of facilitating the collection, tabulation, presenta- tion and analysis of data relating to establishments; and for promoting uniformity and comparability in the presentation of statistical data collected by various agencies of the United States Government, State agencies, trade associations, and private research ; (OMB 1987, pll). The SIC code is thus used by the Federal government to promote comparability when describing the economy. The CTAP adopted the use of the SIC Code in order to classify sources of stress on the environment consistent within this economic Please note that
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