Where is Spanish mainly used in Paraguay?

In Paraguay, Spanish is used almost exclusively in the realms of government and business.12

While both Spanish and Guaraní are official languages of the country, their usage patterns differ significantly. Guaraní is spoken by the vast majority of the population—nearly nine-tenths—and has been used as a language of instruction in schools since 1996. Many Paraguayans are bilingual, utilizing both languages in their daily lives.12