If your New Year’s resolution was to watch less television, don’t expect any help from Hollywood.

The number of original scripted shows on streaming services such as Netflix, Hulu and Amazon Prime grew 30% in 2017, while overall scripted TV across all platforms was up 7%, according to data from FX Networks.

The total number of scripted shows in 2017 hit 487, according to FX’s tabulations, surpassing the previous record of 455 the year before. Since 2012, the number of scripted shows has jumped 69% from 288 programs.

The data has become a stable of FX’s presentations during the Television Critics Association’s press tour, a semiannual event that’s taking place in Pasadena, Calif.

FX Networks Chief Executive John Landgraf has often used the data to lament what he has dubbed the era of “peak TV,” in which shows face challenges finding enough creative talent and gaining traction with viewers in the age of disruption.

Speaking to reporters Friday, Mr. Landgraf quoted the opening of Charles Dickens’s classic “A Tale of Two Cites,” saying: “It was the best of times, it was the worst of times.”

Original shows on streaming services accounted for 117 of the 487 programs last year. But the number of scripted shows also grew on broadcast television and pay-cable channels such as HBO and Showtime—up 4.8% to 153 shows and 17% to 42 shows, respectively.

There was a 4.3% decline in scripted shows on basic or commercial cable channels, down to 175 programs last year.

Mr. Landgraf was more upbeat about the potential acquisition of FX Networks, known for its dark and edgy content. FX Networks is among the entertainment assets that 21st Century Fox is selling to Walt Disney Co. for $52.4 billion.

Being part of a larger Disney empire that wants to compete with Netflix and offer lots of different styles of programming will “undoubtedly help our brand remain relevant,” he said.

Disney Chief Executive Robert Iger “seems to have really wanted FX to be part of the larger plans and that we do something that’s unique,” Mr. Landgraf said.

21st Century Fox and Wall Street Journal parent News Corp share common ownership.

Mr. Landgraf also said the company had conducted an investigation into shows that actor and producer Louis C.K. was involved in for any inappropriate sexual behavior and found none.

Following a New York Times article last year that described incidents of sexual misconduct around female comedians, Mr. C.K. acknowledged his behavior and expressed remorse.

When the news of Mr. C.K.’s behavior broke, FX cut ties with him, and he is longer involved in producing shows there including “Better Things.” FX also removed episodes of Mr. C.K.’s critically acclaimed comedy “Louie” from its on-demand platforms.

Asked if FX would eventually return the episodes to its on-demand platforms, Mr. Landgraf said he didn’t know.

“I still think it’s a great show. If you thought it was art, it’s still art,” he said.

Write to Joe Flint at joe.flint@wsj.com