Open EACH menu link in new tab

I got a reply on my last question referring to opening menu items in a new window, which worked. As I updated the theme today, I found I had to go back and reinsert that code:

<?php
add_filter( 'nav_menu_link_attributes','nobita_add_attribute', 10, 3 );

function nobita_add_attribute( $content,$item, $args ){

 $content['target']= '_brank';
 return $content;
}
?>

What I noticed though was that the code opens one new window and each additional item clicked refreshes that tab to the new content. What code do I need to make 5 clicked menu items open in 5 different tabs?

Thanks.