Never worry about updating your copyright notice again!
The best way to add a copyright notice to your site is to include a range of dates, from first publish to today. This plugin automatically gets the date of your first published content and uses it to create the copyright range.
Add the line <?php do_action( 'copyright_autoupdater_footer' ); ?> to your footer template file. You can wrap this in any HTML element to adjust the layout.