Can I count inside blocks?

Using blocks to create sections on a single page site and using the title of each block to create the page menu. However, I'd like to display the count:

1. Item
2. Item
3. Item
4. Item ...

Is it possible to output the count as I loop through the blocks:

    <perch:blocks>
      <perch:block type="text" label="Text">
        <li class="active"><span class="num">1</span><span class="text"><perch:content id="text_block_title" /></span></li>
      </perch:block>
    </perch:blocks>