But that does only work for consecutive years
- first
- second
- third
2008. first
2014. second
2015. third
Maybe using HTML instead of Markdown also works as an alternative:
- 1997. first
- 2000. second
- 2015. third
<ul>
<li> 1997. first</li>
<li> 2000. second</li>
<li> 2015. third</li>
</ul>