Отображение всех данных через class

'use strict'; 
 
class Worker { 
    constructor(name,city,age,contractDate,standing,salary){ 
        this.name = name; 
        this.city = city; 
        this.age = age; 
        this.contractDate = contractDate; 
        this.standing = standing; 
        this.salary = salary; 
    } 
     
    print(){ 
      let report = document.getElementById('report'); 
      report.innerHTML = ` 
        Имя: ${this.name} <br> 
        Город: ${this.city} <br>  
        Возраст: ${this.age} <br> 
        Дата контракта: ${this.contractDate} <br> 
        Стаж: ${this.standing} <br> 
        Оклад: ${this.salary} <br> 
        Уволен <input type="checkbox"> 
`; 
    } 
} 
 
let worker1 = new Worker('Александр', 'Минск', 32, '15.08.2018', '???','1000USD'); 
let worker2 = new Worker('John', 'Vilnius', 35, '02.11.2017', '???', '800USD'); 
 
worker1.print(); 
worker2.print();

<p id="report"></p>