Based on the annual reports of the postal services of Australia, Germany, Japan and Sweden, it appears that an annual retention of between 1.1 per cent and 3.8 per cent of annual sales is included in their budgets.
根据澳大利亚、德国、日本和瑞典邮政服务部门的年度报告，在其预算中每年保留相当于年销售额1.1％至3.8％的款额。