在这个table中所有属性可以非必填,但是填了一个属性年份就为必填,请问各位大佬怎么写.

<table class="projectTable" :class="{'disable': disable}">
      <tr>
        <td class="label">年份</td>
        <td class="label">投入（万元）</td>
        <td class="label">销售（万元）</td>
        <td class="label">税收（万元）</td>
        <td class="label">净利润（万元）</td>
        <td class="label">备注</td>
      </tr>
      <tr v-for="(item, index) in projectInfo.inputSalesTaxSOList" :key="index">
        <td>
          <el-date-picker
            type="year"
            value-format="yyyy"
            v-model="item.projectYear"
            :disabled="disable"
          />
        </td>
        <td><input type="text" :disabled="disable" v-model="item.investAmount"></td>
        <td><input type="text" :disabled="disable" v-model="item.salesAmount"></td>
        <td><input type="text" :disabled="disable" v-model="item.tax"></td>
        <td><input type="text" :disabled="disable" v-model="item.netProfit"></td>
        <!-- <td><input type="text" v-model="item.remarks"></td> -->
        <td><el-input
          type="textarea"
          autosize
          v-model="item.remarks"
          maxlength="50"
          :disabled="disable"
          show-word-limit /></td>
      </tr>
    </table>