https://www.cnet.com/news/amazon-shipped-more-than-5-billion-items-via-prime-in-2017/

The company said it shipped more than 5 billion items via its Prime service in 2017. Prime, which costs $99 a year or $10.99 a month, provides members with free two-day shipping on eligible purchases in the US, as well as unlimited streaming of movies and TV shows with Prime Video, among other benefits. 

More new paid members joined Prime this year than any other year, Amazon Prime Vice President Greg Greeley said in a statement, adding, "members used digital benefits like Prime Video, Prime Music and Prime Reading more than ever before."