Ask Colin

I do not know of a website where you can see it. However, I put the complete historical spreadsheet file up on the Data Files page of my website www.bwts.com.au at the end of every month. It is quite easy to download this and chart it in Excel. However, you do not need to chart it. There is only one calculation point each month and what you need to know is easily seen from the last column of the spreadsheet without plotting it in a chart.