Flipkart's demand planning team is working on forecasting the demand for the next year. The team has gathered the demand data for the past 15 months and is now trying to decide the most suitable (accurate) method to forecast the demand for the next year. Some of the analysts in the team have suggested using the Time series method. Depending on the demand trend characteristics and category characteristics at Flipkart, when will the Time series method be the most suitable to forecast demand