Today Amazon released a ‘look how awesome our Prime service is doing” update, and as a part of that self-promotion effort also gave us some pretty interesting stats about the seven-year-old program.

First, Amazon is happy to announced that Prime has hit a significant milestone. As of today, more items are shipped using Prime’s free two-day shipping benefit than Amazon’s older free Super Saver Shipping initiative. If it’s been awhile since you’ve made a purchase on Amazon, the Super Saver Shipping offers free shipping on any order over $25. Amazon says that they’ve extended the amount of products offered via Prime Two-Day Shipping to 15 million.

Some more interesting facts about Prime Free Two-Day Shipping?

• The top two most-shipped items are the Kindle Fire and the original Kindle.  Amazon says that the first book in the Fifty Shades of Grey series is number four.
• If you’re a member of Amazon Prime, you could ship 500 products through Two-Day Shipping every day for the rest of your life and still not ship every product available.

And of course, Amazon Prime is not only about free shipping. There’s that whole streaming video platform element to it. Here are some stats about Prime Instant Video:

• In a given week, 96.4 percent of the Prime Instant Video catalog is viewed.
• The number of titles available for unlimited streaming through Prime Instant Video has increased from roughly 5,000 titles at launch to over 22,000 today. Just this year alone, the title count has grown from 13,000 to over 22,000, an increase of 70 percent.
• The most watched TV show available through Prime Instant Video is Downton Abbey Season 1.
• The most watched movie available through Prime Instant Video is The Girl With the Dragon Tattoo (English Subtitled).

Also, the most borrowed book in the Kindle Owners’ Lending Library is The Hunger Games, which just ousted Harry Potter as the most popular series on Amazon (in terms of total purchases, both print and Kindle).

“Since Amazon launched in 1995, we’ve been focused on growing selection for our customers. Following the introduction of Amazon Prime in 2005, we’ve worked hard to grow Prime selection as well. We’re incredibly proud to be able to offer more than 15 million Prime items today. We’ve also grown the Prime Instant Video library to more than 22,000 movies and TV episodes, all with unlimited streaming, and Prime members can borrow more than 180,000 books for free, with no due dates, using the Kindle Owners’ Lending Library – that’s up from roughly 5,000 when the program launched less than a year ago,” said Amazon CEO Jeff Bezos.

Last week, Amazon announced a few new content partnerships for Prime Instant Video. One will bring sports documentaries including ESPN’s 30 for 30 series, and the other beefs up NBCUniversal content like Battlestar Galactica & Parks and Recreation.