average monthly wage Bureau of Labor and Statistics Construction Laborers bls.gov Constructor Worker day laborer U.S. Bureau of Labor Statistics: Construction Laborers U.S. Bureau of Labor Statistics bls.gov 1.3 million workers Construction laborers bls.gov day laborer construction workers bls.gov Construction Laborers 25 percent growth Bureau of Labor Statistics: Construction Laborers bls.gov Construction laborers and helpers bls.gov bls.gov Bureau of Labor Statistics: Construction Laborers