Conclusion: "While it took a while for TV and movies to catch up, they undoubtedly did."

The graphs and conclusion are from Michael Barthel's "It Doesn't Matter Which You Heard" - The Curious Cultural Journey of Leonard Cohen's "Hallelujah," the seminal 2007 essay explicating the transformation of "Hallelujah" from a track on Leonard Cohen's Various Positions album to a handy signifier of mood and drama, now at risk of becoming a cliche, through its near ubiquity in films and TV shows.

While the graphs end at 2006 (the essay itself was completed in 2007), it seems a inescapable observation that the trend has continued upward since then.