There is currently 4,129,249.77 IGM, with the current method of purchasing IGM being either 350 IGM for $10 or 800 IGM for $20, the conversion rate is either 35 to 1 or 40 to 1. So, to convert IGM to USD, 4.1 mil by either 35 or 40. This leads to a range of values from a min of 102,500 USD to 117,142 USD, this is unadjusted though. To adjust for inflation, it can be assumed that the values were created at the creation of the server back in 2013 (I think), this means that the value of the dollar has changed by .02, so one 2013 dollar is worth 1.02 2016 dollars. This means that the value of all the currency on ht is now either 119,483 or 104,550 USD. Now, to calculate the inflation of the IGM, a product is needed to use as the price index. In this case, diamond probably works best as it is near impossible to farm (ignoring villager tool/armor trades), this its own inflation is negligible. So, by using the price of diamond 1 year ago (~2.8 I think) and the current price (~1.5 I think) the inflation can be determined. To give that 1 1-year old IGC is worth about 1.87 current IGC, so 102500 2013 USD worth of IGC (4.1 mil 2013 IGC) would be about 7.667 mil 2016 IGC. By comparison, if you saved the 2013 USD and the return on savings just kept up with inflation, your 104,550 2016 USD would get you 4.2 mil IGC. These numbers are obviously not perfect as I don't have a full record on diamond prices and using diamonds as the price index isn't great as there is a near infinite account of them with the resource world, in addition most of the currency is not backed by anything meaningful, meaning until an authority sets it's value, the value is extremely volatile, with the rise and fall of major shops able to change it dramatically. Also, there is no real record of IGC that I know of that covers all the time from start of currency to the present. If you want to take something awayfrom this if should be that the value of the IGC has been changing much faster than it probably should be
Sorry about that whole “shooting you” thing, but I know if you look deep into your heart, which is currently all over that tree, you’ll find a way to forgive me.