Add punctuation to the following sentence: The observed change in storage practice over the period 1990 to 2003 has increased the mean annual CH4 emission by 3090 mostly due to changes in the amount of manure being stored
The observed change in storage practice over the period 1990 to 2003 has increased the mean annual CH4 emission by 30-90%, mostly due to changes in the amount of manure being stored.