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某估价对象为一旧厂房改造的超级市场，建设期为2年，该厂房建成5年后补办了土地使用权出让用续，土地使用期限为40年，土地使用权出让合同约定土地使用期间届满不可续期。建筑物经济寿命为50年。假设残值率为零，采用直线法计算建筑物折旧时年折旧率为（ ）。
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