COVID-19 2020 1 9 1 29 4 16 2021 7 16 96.7% 2020 3 3 COVID- 19 97.9% 95.3%, COVID-19 2020 96.5% 98.7% 2021 96.9% 98.6% 2020 2 2020 1 13 1 14 8 4 14 235 2021 4 27 "COVID-19 - " 236 8 26 " " 26 1,133 20 Chapter3 01