period,ae_ratio_pct,vaccine_context
Q2 2020,115,0% vaccinated
Q3 2020,110,0% vaccinated
Q4 2020,122,EUA granted December
Q1 2021,118,Elderly vaccination
Q2 2021,105,Mass vaccination ~50%
Q3 2021,117,~65% coverage + Delta
Q4 2021,112,Boosters begin
Q1 2022,108,Omicron + boosters
Q2 2022,97,High coverage + natural immunity