BLOOMBERG - Sep 13 - Revenue from Indian online dating expanded ~21% annually from 2010 to 2015, and will reach 20.6B rupees ($322M) by 2020, according to Ken Research Pvt Ltd. India's wedding market, including matchmaking services, venue-hire, catering, decorating and photography, is worth ~$54B a year. Matrimony.com, which opened an IPO on Monday, added 3M user-profiles last year, of which 40% were in semi-urban areas. People are shifting to mobiles to access dating sites. Three years ago, 60% of Shaadi.com's 3M user base was accessing the site via desktop. That proportion has shrunk to 20%, while mobile access jumped to 80% from 40%.