SELECT 
      MONTHNAME(createDt) AS month,
      YEAR(createDt) AS year,
      COUNT(*) AS total
FROM tracking
GROUP BY MONTH(createDt), YEAR(createDt)
ORDER BY id


# display by day instead:
SELECT 
      from_unixtime(createDt,'%D %M, %Y') AS day, 
      count(*) as total
FROM tracking
GROUP BY day
ORDER BY joined DESC