How to Insert multiple checkbox values to db in wordpress

Im trying to insert multiple checkbox values to mysql database in wordpress but its only inserting the last one I choose.

I have tried putting [] after Country but then it inserts only the word "Array"

<div class="container"> <form action="" method="post"> <input type="checkbox" id="Country" name="Country[]" value="India">India<br/> <input type="checkbox" id="Country" name="Country[]" value="USA">USA<br/> <input type="checkbox" id="Country" name="Country[]" value="Australia">Australia<br/> <input type="checkbox" id="Country" name="Country[]" value="Europe">Europe<br/> <input type="checkbox" id="Country" name="Country[]" value="Italy">Italy<br/> <br> <input type="submit" id="submit" name="submit132" value="Submit Values" class="btn btn-default"> </form> </div>

and here is the code from my functions.php file

if(isset($_POST['submit132'])) {

global $wbdb;
include ("yhteysEn.php");

$country = $_POST["Country"];


$sql2 = "INSERT INTO wp_checkbox (C_values) VALUES ('$country');";
try { 
 $kysely2 = $yhteys->prepare($sql2); 
 $kysely2->execute(); 
 } catch (PDOException $e) { 
 die("VIRHE NRO 2: " . $e->getMessage()); 
} 

}

I want to select multiple values from the checkbox and insert them to my db table like "India, USA, Italy"