The conversion rates from Ringgit to other major currencies (A) from the beginning (on the left of the chart above marked with a white dot) are being used as references. From there on, the subsequent conversion rates are being compared to the initial references to see if the value of Ringgit is appreciating or depreciating and by how much since the beginning of the period.
For example, over the last 3 months till , the value of the Ringgit compared to other currencies has changed:
Courtesy Chok Leong.