Here is a plot showing the GRT circulation over 5 years from the launch date (i.e., December 17, 2020 at 6:00 PM):

Indexers who helped during the testnet phase also received a reward in the form of GRT equivalent to $10,000 to as much as $100,000<security:.

GRT:> Staking

In order for users to purchase shares in the nodes that run the entire platform and sell their services on the "query market," they must stake their GRT. In return, they receive financial rewards. If the indexers are malicious and, for example, intentionally modify data, this is punished expensively in the form of taking away their staked GRT tokens.