Golds supply supply increases by1.4% per annum.
https://publications.industry.gov.au/publications/resourcesandenergyquarterlydecember2019/documents/Resources-and-Energy-Quarterly-December-2019-Gold.pdf
There is also an unknown amount of Gold still out there as opposed to Bitcoins maximum supply of 21 million.
Following the last halfening the inflation rate of growth of Bitcoin is 1.8%. After the next halfening it will fall to 0.9%.It is not known what the rate of new gold coming into the market will be then but I really doubt it will of dropped off that much
