Computer Science (CS) education is an emergent growth area in schools worldwide. This paper explores how CS education has evolved at the high school level (grades 10-12) in the Canadian province of Alberta over the past decade after a reorganization and curriculum redesign of its Computing Science Education (CSE) program. In partnership with Alberta Education, a complete list of course records was obtained for high school students who had taken CSE course credits between 2009 and 2019. These course completions were analyzed for overall growth trends and then further examined with respect to course level, urbanicity, and gender. We found that growth in course credit completion has been consistent over the 10-year study period (annual average growth rate of 33.5%). Advanced course credits have grown faster than introductory course credits, urban areas have grown faster than rural areas, and gender growth rates have been similar for males and females. Understanding the growth rates of CSE course enrollments at the high school level will contribute to identifying some of the challenges encountered during the implementation of the CSE program of studies in Alberta.