Construction receipts were obtained from census respondent forms. Data for establishments whose respondent forms were not received at the time data were tabulated were calculated using industry averages and imputation for nonresponse. The following symbols are shown where estimated imputation based on construction receipts account for 10 percent or more of the figures shown:

1 - 10 to 19 percent estimated

2 - 20 to 29 percent estimated

3 - 30 to 39 percent estimated

4 - 40 to 49 percent estimated

5 - 50 to 59 percent estimated

6 - 60 to 69 percent estimated

7 - 70 to 79 percent estimated

8 - 80 to 89 percent estimated

9 - 90 percent or more estimated