1. 20a. Self-employment as a percentage of the workforce, construction and all non-agricultural industries,

2. 20b. Percentage of self-employed, by selected construction occupations, 2005
51%
40%
36%
36%
31%
22%
21%
21%
18%
17%
17%
15%
15%
14%
13%
12%
10% 9% 7% 7% 3% 3% 1%
24%

3. 20c. Number of construction establishments, with and without payroll, 1967-2002

4. 20d. Percentage of misclassified workers among employers engaged in misclassification, construction and other industries