According to the 2005 India Human Development Survey, of the 41,554 surveyed, households reported that 72% of men (29,918) did not speak any English, 28% (11,635) spoke at least some English, and 5% (2,077, roughly 17.9% of those who spoke at least some English) spoke fluent English. Among women, the corresponding percentages were 83% (34,489) speaking no English, 17% (7,064) speaking at least some English, and 3% (1,246, roughly 17.6% of those who spoke at least some English) speaking English fluently.  According to statistics of District Information System for Education (DISE) of National University of Educational Planning and Administration under Ministry of Human Resource Development, Government of India, enrollment in English-medium schools increased by 50% between 2008-09 and 2013-14. The number of English-medium school students in India increased from over 15 million in 2008-09 to 29 million by 2013-14.
Question: How many years was the time span where the enrollment in English-medium schools in India increased by 50%?
Answer: 5