| activity_date | The date of the staking activity | 
| last_activity_utime | The latest Unix timestamp of activity for the day | 
| total_reward_amount | Total amount of rewards distributed for the day | 
| total_usd_amount | Total USD value of rewards distributed for the day | 
| median_elector_balance | Median balance of the Elector contract for the day | 
| median_elector_usd_balance | Median USD value of the Elector contract balance for the day | 
| apy | Annual Percentage Yield (calculated as (total_reward_amount / median_elector_balance) _ 365 _ 100). Null for dates before April 2020 |