How many houses in Weifang Linqu are made of steel frames?

Weifang Tailai Steel Structure Engineering Co., Ltd., Linqu Xiujuan Steel Plastic Products Factory, Linqu Zhenhua Steel Aluminum Products Processing Factory, Linqu Zong Wei Steel Structure Fittings Processing Factory, Linqu Liang Yi Steel Structure Fittings Factory, Weifang Yu Shun Steel Structure Engineering Co., Ltd., Linqu Changyue Steel Structure Products Processing Factory, Weifang Hester Steel Structure Engineering Co., Ltd. and Weifang Quanshun Steel Structure Engineering Co., Ltd.