human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Country, Annual CO2 emissions (in thousands of metric tons), GDP (current, in billions of US dollars), GDP per Emissions (in US dollars per ton), GDP (PPP, in billions of current international dollars), PPP GDP per Emissions (in international dollars per ton)
###Question: when the annual co2 emissions (in thousands of metric tons) is 1811, what is the country?
gpt
SELECT Country FROM table WHERE Annual CO2 emissions (in thousands of metric tons) = 1811