Most web pages on the Internet are in English, with varying amounts of information available in many other languages. In April 2013, almost 55% of the most visited websites used English as their content language. Other top languages which are used at least in 2% of websites are Russian, German, Spanish, Chinese, French, Japanese, Arabic and Portuguese.
The list below shows the Estimates of the percentages of Web sites using various content languages as of 12 March 2014
Note that these figures are based on the one million most visited web sites (e.g. 0.27% of the total web sites according to figures of December 2011), according to Alexa.com, and language is identified using only the home page of the sites in most cases. As a consequence, the figures show a significantly higher percentage for many languages (especially for English) as compared to the figures for all websites. The figures for all websites are unknown, but some sources estimate below 50% for English
The number of non-English pages is rapidly expanding. The use of English online increased by around 281% from 2001 to 2011, however this is far less than Spanish (743%), Chinese (1,277%), Russian (1,826%) or Arabic (2,501%) over the same period.
Courtesy : Wikipedia