WP Post By Year

<?php
    function edge_subcat_posts_monthly($curr_post, $curr_cat) {
    global $post;
    $ul_open = false;
    $previous_year = 0;

    $args=array(
      'cat'     => $curr_cat,
      'posts_per_page' => -1,
      'orderby' => 'date',
      'order' => 'DESC',
      'caller_get_posts'=>1
    );

    $my_query = new WP_Query($args);

    echo '<ul>';
    if( $my_query->have_posts() ) {
      $ymdate = '';

       while ($my_query->have_posts()) : $my_query->the_post();

        $year = mysql2date("Y", $post->post_date);

        if ( $previous_year != $year) {
            if($ul_open == true){
                echo '</ul><div class="clear"></div>';
                }

                        echo '<li><div class="clear"></div><h4 id="cat-'.$year.'">'.$year.'</h4><ul id="posts-'.$year.'" >';

                $ul_open = true;
             }
             $previous_year = $year;
            ?>
                <li><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>" <?php if($curr_post == $post->ID){ echo 'class="active"'; } ?>><?php the_title(); ?></a></li>
            <?php

          endwhile;
          echo '</ul><div class="clear"></div>';

        }
        echo '</ul>';
}