Counts the year of birth (year_of_birth) across all person records. All existing values for year of birth are summarized.

Input:
<None>

Sample query run:
The following is a sample run of the query.

SELECT year_of_birth,
       COUNT(person_id) AS Num_Persons_count
FROM   person
GROUP BY year_of_birth
ORDER BY year_of_birth

Output:
Output field list:

Field	Description
year_of_birth	Year of birth of the patient
Num_Persons_count	Number of patients in the dataset of specific year of birth