If it's so classic, care to explain why the autism rate has risen so much(long term)? If a disease that gets diagnosed based on a spectrum of behavioral cues is

If it's so classic, care to explain why the autism rate has risen so much(long term)? If a disease that gets diagnosed based on a spectrum of behavioral cues is on the rise, could you maybe consider that people are just quicker to blame autism?(and cover a larger, milder range of behaviors)