Online retail sales will grow at an average of 11.3% per year over the next five years in Western Europe. Italy and Spain will see the fastest online sales growth. By 2022, 20% of non-grocery retail sales will be online. Although grocery will be one of the fastest-growing online retail categories, just 4.4% 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.