1800 Salvadorans were surveyed by National Bureau of Economic Research (NBER), this number of people surveyed are not much but this still gives some information about the use of bitcoin as a legal tender in El Salvador.

https://cointelegraph.com/news/one-fifth-of-businesses-in-el-salvador-now-accept-bitcoin-nber-study

According to the report from National Bureau of Economic Research (NBER)

Chivo wallet users decreased the use of cash by 10% and decrease the use of debit cards by 11%

Among owners of firms and employees familiar with the companies payment methods, 20% said their company or place of work accept bitcoin while 25% accepts credit card.

Also in the research, 71% of bitcoin sales are mostly converted to dollar, 17% stored as dollar on Chivo wallet while 10% stored as bitcoin.

A question
Salvadorans using Chivo wallet and Salvadorans using bank, which one are more?