Add numbering to the view that contain condition

I have a problem where I want to add index numbering 1.2.3.4..etc at my table but the table content have @if($t1,t2,t3,..etc > 0) condition on it, if I hard code the number in view, if it meets $t1,t2,t3,..etc < 0, it will skip the index number

     <thead>
      <tr>
       <th>No.</th>
       <th>Subject name</th>
       <th>No. of students</th>
      </tr>
     </thead>
     <tbody>
        @if($t1>0)
         <tr class="gradeX">
          <td>1</td>
          <td><a href="" target="_blank">Technology & Information System</td>
          <td style="text-align:center"></td>
         </tr>
        @endif
        @if($t2>0)
         <tr class="gradeX">
          <td>2</td>
          <td><a href="" target="_blank">Discrete Structure</td>
          <td style="text-align:center"></td>
         </tr>
        @endif

The output should show the numbering without skipping any number even it skip the condition.

via Chebli Mohamed