13-1 Production Conditions of Construction Enterprises 13-2 Main Indicators on Construction Enterprises Enterprises 13-3 Number of Construction Enterprises by City 13-4 Gross Output Value of Construction Enterprises by City 13-5 Value-added of Construction Enterprises by City 13-6 Total Pre-tax Profits of Construction Enterprises by City 13-7 Total Profits of Construction Enterprises by City 13-8 Floor Space of Buildings under Construction by Construction Enterprises by City 13-9 Number of Employed Persons of Construction Enterprises at the Year-end by City 13-10 Labor Productivity of Construction Enterprises by City