It can be found that the trend of gold price increases exponentially at 20 16 without the intervention of the central bank.
Observing the whole historical trend chart, we can find that the measures taken by the central bank have certain effects at the beginning of 20 17, and the growth rate of gold price has been controlled to a certain extent, which is lower than the average level at the end of 20 16.
The trend of 20 18 gold price can be linearly or logically regressed with the data of 20 17.
Generally speaking, 20 18 needs to control the price of gold, otherwise it will accelerate the growth.