NPS (1 TO 11)

NPS question from 0 to 10 leabelled as 1 to 10 and NA. but when i hit back button my answers go 1 step back like 10 becomes 9 and 9 as 8 and so on. How can i changes this>

Qualtrics.SurveyEngine.addOnload(function()
{
    /*Place your JavaScript here to run when the page loads*/

var selChoiceLoad = this.getSelectedChoices();
var selChoiceNumLoad = parseInt(selChoiceLoad) - 1;
this.setChoiceValue(selChoiceNumLoad, true);

});

Qualtrics.SurveyEngine.addOnReady(function()
{
    /*Place your JavaScript here to run when the page is fully displayed*/
jQuery("#"+this.questionId+"-0-label").html("1");
jQuery("#"+this.questionId+"-1-label").html("2");
jQuery("#"+this.questionId+"-2-label").html("3");
jQuery("#"+this.questionId+"-3-label").html("4");
jQuery("#"+this.questionId+"-4-label").html("5");
jQuery("#"+this.questionId+"-5-label").html("6");
jQuery("#"+this.questionId+"-6-label").html("7");
jQuery("#"+this.questionId+"-7-label").html("8");
jQuery("#"+this.questionId+"-8-label").html("9");
jQuery("#"+this.questionId+"-9-label").html("10");
jQuery("#"+this.questionId+"-10-label").html("Geen antwoord").css({"padding":"1px"});
});

Qualtrics.SurveyEngine.addOnUnload(function()
{
    /*Place your JavaScript here to run when the page is unloaded*/

});

Qualtrics.SurveyEngine.addOnPageSubmit(function(type) {
 if(type == "next") {
 var selChoice = this.getSelectedChoices();
 if(selChoice.length > 0) { // Ensure a choice is selected
 var selChoiceNum = parseInt(selChoice[0]); // Use the first selected value
 this.setChoiceValue(selChoiceNum, true);

 jQuery("#"+this.questionId+"-"+selChoiceNum+"-label").css({
 "background": "hashtag#f1f1f1",
 "border": "none",
 "color": "#000000"
 });
 }
 }
});