I want to know the answer to the following question:
In what year did the Motion Picture Association of America introduce its rating system?
All the background I'm provided with is that "– sometimes featuring nudity, sexual content, violence and/or strong profanity; the network also features rating bumpers prior to the start of a program (most programs on TCM, especially films, are rated for content using the TV Parental Guidelines, in lieu of the MPAA's rating system).". Is that enough to answer the question?