前年同月比
ぜんねんどうげつひ
compared to the same month the previous year (e.g. in statistics, sales, electricity usage)
同前 is read as どうぜん (douzen) and means same as above.
どうぜん
douzen
ぜんねんどうげつひ
compared to the same month the previous year (e.g. in statistics, sales, electricity usage)