bootstrap等比分为5格

bootstrap等比分成5格
bootstrap默认是12列的,但我想分成等比分成5份该怎么做?用的V3.3.4
------解决思路----------------------
<div class="row">
        <div class="col-xs-5ths">
<span>.col-xs-5ths</span>
</div>
        <div class="col-xs-5ths">
<span>.col-xs-5ths</span>
</div>
        <div class="col-xs-5ths">
<span>.col-xs-5ths</span>
</div>
        <div class="col-xs-5ths">
<span>.col-xs-5ths</span>
</div>
        <div class="col-xs-5ths">
<span>.col-xs-5ths</span>
</div>
</div>

.col-xs-5ths{ width:20%; float:left;}