how to add Nofollow tag in here.

Need help.

I want to add rel nofollow tag to the pagination links that is showed in my website theme.

I am using this function to use pagination.

<div class="tablenav"><?php global $wp_rewrite;
$paginate_base = get_pagenum_link(1);
if (strpos($paginate_base, '?') || ! $wp_rewrite->using_permalinks()) {
$paginate_format = '';
$paginate_base = add_query_arg('paged', '%#%');
} else {
$paginate_format = (substr($paginate_base, -1 ,1) == '/' ? '' : '/') .
user_trailingslashit('page/%#%/', 'paged');;
$paginate_base .= '%_%';
}
echo paginate_links( array(
'base' => $paginate_base,
'format' => $paginate_format,
'total' => $wp_query->max_num_pages,
'mid_size' => 5,
'current' => ($paged ? $paged : 1),
)); ?></div>

can’t find the way i can put here rel=nofollow.