US online retail sales continue to thrive: They accounted for almost 9% of the $3.2 trillion total retail market in 2013 and will continue to grow at a compound annual growth rate (CAGR) of nearly 10% through 2018. With a majority of the online population already buying online, future growth in online retail sales will largely be driven by an increase in online spending per buyer, surpassing $2,000 per year by 2018. The forecast details growth across 30 product categories and historical data going back to 1998.