The following line graph depicts the yearly population growth of a town over a five-year period. Each year's population is noted on the vertical axis, while the years are represented on the horizontal axis.
Years: 2019, 2020, 2021, 2022, 2023
Population: 10,000 in 2019, 10,500 in 2020, 11,000 in 2021, 11,500 in 2022, 12,000 in 2023
Based on the graph, what was the average yearly population increase over the five-year period?