You can still change it yearly if you wish, but the E-TEC gear oil only needs a change at 300 hrs. or 3 years, whichever comes first. That doesn't mean that you should ignore it for that time, as it is good practice to remove the propeller occasionally to check for fishing line around the seal and shaft, and to check the oil level and condition.
The owners manual should mention this in the maintenance section.
-- Travis McGee, main character in a book series by John D. McDonald
The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.