在ICA网站上看到这句话：A letter from sponsor’s and applicant’s (if applicable) employer stating the date of employment, position held, salary per month for the last 6 months with breakdown into basic, overtime and allowance per month (see item 7 below). The letter, addressed to the Controller of Immigration, should be dated within 1 month from the date of submission.

想确定一下，要列我过去6个月的平均工资，还是我过去6个月的每个月的工资？
如果只是平均工资还好办，如果是每个月的工资详情就麻烦了，因为公司现在已经很难把我过去6个月的工资详情都找出来了。
请朋友帮助解释一下，感激不尽。