Can you please take a look at this code and let me know why I am not able add the `variable` into the table?

```js
var variable = "app ha";
var table = '<table class="table table-striped table-bordered"><tr><td>Energy Target</td><td><span class="'+ variable +'"></span></td></tr><tr><td>Run of River Priorities:</td><td><span class="'+ variable +'"></span></td></tr><tr><td>Species:</td><td><span class="'+ variable +'"></span></td></tr><tr><td>Disturbance:</td><td><span class="'+ variable +'"></span></td></tr><tr><td>Slider:</td><td><span class="'+ variable +'"></span></td></tr></table>';

 $("body").append(table);
```

```html
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
```