Online retail sales will grow at an average of 11.9% per year over the next five years in Western Europe. Italy and Spain will see the fastest online sales growth. By 2022, 21% of non-grocery retail sales will be online. Although grocery will be one of the fastest-growing online retail categories, just 4.5% of grocery sales will occur online in 2022. This forecast details growth for 22 product categories across 17 countries in Western Europe, with historical online category sales going back to 2002. It includes the most recent data from the end of 2017.