Final Ratings Update: According to Nielsen’s final live+same-day report, Monday’s “Supergirl” drew a 1.5 adults 18-49 rating and reached 7.187 million viewers.

The numbers, which trail the 1.8 and 7.769 million marks posted by last week’s episode, represent lows for the series.

Monday’s “Supergirl” was the fifth overall installment and fourth to air in the regular 8PM timeslot. Following its premiere, “Supergirl” has endured four straight declines in total viewership. Last week’s episode enjoyed a week-to-week gain in adults 18-49, but it turned away that gain — and then some — this week.

This week’s episode notably faced competition from night one of ABC’s “Dancing With The Stars” finale. While not a blockbuster performer (2.1, 13.287 million from 8-10PM ET), it may have slightly impacted this week’s “Supergirl” performance.

CBS’ Monday lineup also included “Scorpion” (1.7, 8.949m) and “NCIS: Los Angeles” (1.2, 7.801m).

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Last week’s adults 18-49 uptick was not the beginning of a streak for CBS’ “Supergirl.” Monday’s episode suffered a decline in the coveted young adults demographic. It also continued its streak of losses in total viewership.

Per Nielsen fast national data, the episode drew a 1.5 adults 18-49 rating and 7.191 million total viewers. Down from the 1.8 and 7.769 marks posted by last week’s episode, the two numbers represent lows for the CBS series.

This week’s episode was the series’ fifth installment — and fourth to air in the regular 8PM timeslot.

“Supergirl” did, notably, face competition from night one of the “Dancing With The Stars” finale. An increase next week would go a long way in proving this week’s decline was specifically driven by that competitive broadcast.

Working against that case is the fact that “Scorpion” did not suffer an adults 18-49 decline this week. It drew a 1.7 with 8.869 million total viewers; last week’s episode posted a 1.7 with 9.163 million.

“NCIS: Los Angeles” closed CBS’ night with a 1.2 and 7.682 million.