Below is a super easy-to-install script that will track clicks on outbound links from your website using Google Analytics event tracking.
You can access this data in your Google Analytics event tracking dashboard (Behavior > Events). This script will send data to GA in the following format (though you can easily change it):
|Description||Cateogry title||URL of outbound link||URL of page on which link was clicked|
|Code||‘Outbound Link’||$(this).attr(“href”)||‘From page: ‘.concat(document.URL)|
|Example||Outbound Link||https://github.com/alexpmil||From page: http://alex.miller.im/posts/google-analytics-event-track-outbound-links|