- id
 id in the form "country|state|city".
 
 - date
 date.
 
 - country
 administrative area level 1.
 
 - state
 administrative area level 2.
 
 - city
 administrative area level 3.
 
 - lat
 latitude.
 
 - lng
 longitude.
 
 - deaths
 the number of deaths.
 
 - confirmed
 the number of cases.
 
 - tests
 the number of tests.
 
 - deaths_new
 daily increase in the number of deaths.
 
 - confirmed_new
 daily increase in the number of cases.
 
 - tests_new
 daily increase in the number of tests.
 
 - pop
 total population.
 
 - pop_14
 population ages 0-14 (% of total population).
 
 - pop_15_64
 population ages 15-64 (% of total population).
 
 - pop_65
 population ages 65+ (% of total population).
 
 - pop_age
 median age of population.
 
 - pop_density
 population density per km2.
 
 - pop_death_rate
 population mortality rate.