The output of rapeseed in a certain county last year was 18,300 tons, an increase of 22% compared with the previous year. How many tons of rapeseed was produced in the previous year?
某县去年油菜籽产量为1.83万吨，比前年增产二成二，前年油菜籽产量多少万吨？
<result>2.2326</result>