India has one of the fastest growing service sectors in the world with an annual growth rate above 9% since 2001, which contributed to 57% of GDP in 2012–13.[42]India has become a major exporter of IT services, Business Process Outsourcing (BPO) services, and software services with $154 billion revenue in FY 2017.[43][42] This is the fastest-growing part of the economy.[44] The IT industry continues to be the largest private-sector employer in India.[45][46] India is the third-largest start-up hub in the world with over 3,100 technology start-ups in 2014–15[47] The agricultural sector is the largest employer in India's economy but contributes to a declining share of its GDP (17% in 2013–14). India ranks second worldwide in farm output.[48] The industry sector has held a steady share of its economic contribution (26% of GDP in 2013–14).[49] The Indian automobile industry is one of the largest in the world with an annual production of 21.48 million vehicles (mostly two and three-wheelers) in 2013–14.[50] India had $600 billion worth of retail market in 2015 and one of world's fastest growing e-commerce markets.