What was the average annual increase in the number of reindeer in each of the years between 1920 and 1930?

Between 1920 and 1930, the average annual increase in the number of reindeer can be calculated by taking the total increase over that decade and dividing it by 10 years. If specific population numbers for those years are provided, the average annual increase can be determined more accurately. Without precise data, it is impossible to give an exact figure; however, historical trends often show fluctuations in reindeer populations due to factors like climate and human impact.