Bootstrap Datepicker viewmode Years Only show

<div class="input-append date">

 <input  type="text" readonly="readonly" name="date" id="datepicker">    
  
</div>      

$("#datepicker").datepicker( {
    format: "yyyy",
    viewMode: "years", 
    minViewMode: "years"
});

Bootstrap Datepicker viewmode  Years Only show