Well there's nothing that 'limits' it to one specific year, but you have to use the correct variables to control the year being displayed.
The year variable is "yr" not "year". I don't know what you've got coded in the background, I'm going only on what you're passing through the URI.
EPC Tutorials... We're here to help!
Offering custom integration services. Contact me here
* Not affiliated with EasyPHPCalendar or NashTech Inc.