Excerpt from this article:
Pasquier… is also an élite money hunter. He started out casually picking up coins, bills, and dropped MetroCards. “But then I said, Be scientific, keep track of this.” From 1987, when he began recording his findings, through 2014, he retrieved a thousand nine hundred and twenty dollars and eighty-seven cents. From 1987 to 2006, he averaged about fifty-eight dollars a year.
Then Apple introduced the iPhone, and millions of potential competitors started to stare at their screens rather than at the sidewalks. Since 2007, Pasquier has averaged just over ninety-five dollars a year.