Loads posts of different year via AJAX call

I need some advice with this one. I want to load posts of certain years depending what year the user clicks, to achieve this I have the following:

<?php
    $args = array(
            'post_type' => 'post',
            'ignore_sticky_posts' => 1,
            'year'  => '2015',
    );

    $the_query = new WP_Query( $args );
?>

<?php if ( $the_query->have_posts() ) : ?>
        <?php while ( $the_query->have_posts() ) : $the_query->the_post(); ?>

        <div class="post-item" style="margin-bottom: 70px;">
            <div class="post-info">
                <p class="post-time">
                    <?php echo get_the_date(); ?>
                </p>
                <h2 class="post-title">
                    <?php the_title(); ?>
                </h2>
                <div class="post-content">
                    <?php the_content(); ?> 
                </div>
            </div>
        </div>
        <?php endwhile; ?>
<?php endif; ?>

<?php wp_reset_postdata(); ?>

with this I'm displaying all posts of 2015. My question is, how I could AJAXify this. I'm having different Buttons like a Menu with different years. And each querys a different year and displays it.

Thanks