The number of visitors to a national park increased by $15\%$ in $2021$, then decreased by $20\%$ in $2022$, and finally increased by $10\%$ in $2023$. What was the net percentage change in the number of visitors from the end of $2020$ to the end of $2023$? (Round your answer to the nearest tenth of a percent. If it's a decrease, enter a negative value.)