To show your management how you are doing, we have some sources of information for you. Some of the greatest sources of information concerning email trends come from email services like Constant Contact and Mail Chimp. Since they deal with so many industries all over the world there statistics are excellent and revealing. Below are some links to charts of industry standards for email responses. From what we have found, our client's open rates tend to be higher than average from this chart mainly because our clients have extremely targeted recipients.
Click Here For The Constant Contact Response Rate Chart
Click Here For The Mail Chimp Response Rate Chart