CNBC this month posted its worst ratings for the key 25- to 54-year-old demographic since April 1993.

It averaged only 37,000 viewers in that category over a 24-hour period, down 35 percent from a year ago, according to Nielsen, the New York Post reports.

CNBC's audience for that demographic peaked at 162,000 viewers an hour in January 2002.

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A CNBC spokesman told the Post that Nielsen's ratings undercount total viewers.

CNBC competitor Fox Business Network attracted an average of 10,000 viewers an hour for the demographic this month. It too suffered a drop in viewership.

In terms of total viewership, CNBC saw its audience plummet to 128,000 this month, the lowest since September 2004, according to Zero Hedge.

Larry Kudlow's 7 p.m. show, "The Kudlow Report," suffered the largest decrease in audience. The audience fell 53 percent to 20,000 viewers for the 25 to 54 demographic, the Post reports.

"Mad Money," hosted by Jim Cramer, saw its audience decline 38 percent in the category to 25,000.

"Street Signs" represents the only show that kept its audience, the Post reports.

Meanwhile, CNBC's TV ad revenue is set to fall to $214 million this year from $223 million in 2012, according to the Post.

To be sure, CNBC's distribution revenue from cable and satellite TV providers rose a penny to 31 cents per subscriber per month in 2013 from last year.

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