Global subscriptions to Internet-based TV are on track to reach 19.6 mln subscribers in 2008, a 64% increase, according to Gartner. Revenue from worldwide Internet protocol television is forecast to reach $4.5 bln, up 93.5% from a year earlier, with Western Europe boasting the largest number of IPTV subscribers and North America the largest market for IPTV revenue. 1.1% of households worldwide would be using IPTV in 2008, and expects that to rise to 2.8% by 2012.