When flight tickets get cheaper in advance - v2

In When flight tickets get cheaper in advance - v1, I wrote a Google App Script with Google Spreadsheets to track when flight tickets get cheaper in advance. In that script I weekly tracked the minimum return-ticket price from Sydney to Colombo for a fixed departure date (07th of April 2014). In this post, I improved the script and automatically calculated minimum return-ticket price from Sydney to Colombo daily for last 8 months without restricting to a fixed departure date. These details say, for a given date, ticket prices get minimum in advance of 110 days in average (given that you have no preferred departure date).
Here you can find the spreadsheet which contains up-to-date data-set and followings are the charts extracted from the data-set.