<a class="btn btn-filter  dropdown-toggle" href="#" role="button" id="dropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
      Filter by year
    </a>
    <div class="dropdown-menu" aria-labelledby="dropdownMenuLink">
      <%= for i in Time.zone.now.year..2016 do%>
      <a class="dropdown-item" href="/blog/year/<%i%>"><%i%></a>
      <% end %>
      <a class="dropdown-item" href="/blog/year/2016">2016</a>
      <a class="dropdown-item" href="/blog/none">None</a>
    </div>