Online retail sales will grow at an average of 11.5% per year over the next five years in Western Europe. Italy and Spain will see the fastest online sales growth. By 2023, 21% of non-grocery retail sales will be online, up from 13% in 2017. Although grocery will be one of the fastest-growing online retail categories, just 4.6% of grocery sales will occur online in 2023. This forecast details growth for 22 product categories across 17 countries in Western Europe, with historical online category sales going back to 2002.