Sort posts by custom field value

This did the trick. I had to use ‘_year”

<?php $query = new WP_Query(array(
       'post_type' => array('gtcd','user_listing'),
       'posts_per_page' => '999',
       'meta_key' => '_year',
       'orderby' => 'meta_value',               
       'order' => 'ASC' 
    ));

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