This is my coding.

```js
switch(education){
    case "no highschool diploma":
        salary="25636";
        break;
    case "a high school diploma":
        salary="35256";
        break;
    case "an Associate's degree":
        salary = "41496";
        break;
    case "an Bachelor's degree":
        salary = "59124";
        break;
    case "an Master's degree":
        salary = "69732";
        break;
    case "an Professional degree":
        salary = "89960";
        break;
    case "an Doctoral degree":
        salary = "84396";
        break;
}
console.log("In 2015, a person with "+education+" earned an average of "+ salary.toLocaleString("en-US") +"/year.");

```

I wanna know why the result is

> 
> In 2015, a person with a high school diploma earned an average of 35256/year.
> 
> 
> 

Instead of

> 
> In 2015, a person with a high school diploma earned an average of 35,256/year.
> 
> 
> 

Where am I wrong?