There was a day when Amazon came up with a prime membership in the US in 2005. At that time online giant offers its member two-day free shipping as well as discounted shipping rates. The membership fee is also was just $79 annually at that time.
But a lot has changed since then. Annual Membership fees have reached to $99 annually with some additional attractive facilities like free access to a large music library, unlimited video streaming, photo storage and more.
Not only prices and facilities, but a number of prime members in U.S. also increased to double in past two years. According to Consumer Intelligence Research Partners. In March 2015, Amazon prime had around 40 million, which increased to 80 million at the end of March 2017.