20% of apps are only opened once

"To understand how app engagement has changed over the past four years, Localytics examined the App Retention Rate – the average number of times an app was used. Localytics found:
20% of Apps are only opened once, improving from 26% four years ago
During the same period, the percentage of apps used 11 or more times increased 13% and now comprises nearly 40% of all apps.
Android has greater percentage of users opening an app 11 or more times
Sports and Games apps have the highest app abandonment rate of all categories, whereas Weather and Social Networking apps have the lowest"
Source:  Localytics, 11th June 2014