In this week’s edition of Silicon Tally, the numbers we’re discussing involve set-top boxes, billions in loose change and just how many of us actually wear wearables. Will Oremus, tech blogger for Slate, runs the following numbers:

$70 billion

The amount Americans spent on gift cards last year. (Marketplace)

1/3

The percentage of wearable computer consumers that end up abandoning their devices after six months of their purchase. (Guardian)

$99

The price of Amazon’s new set-top box, the Fire TV. (USA Today)

$650,000

The amount of non-work related expenses claimed in 2013 by Facebook CEO Mark Zuckerberg for travel on the company’s private jet. (Business Insider)