Table: queretaro_municipalities
Columns: inegi_code
municipality
municipal_seat
area_km_2
population_2005
population_density_km_2
human_development_index_2000

Question: WHich INEGI code has a Population density (/km 2 ) smaller than 81.4 and 0.6593 Human Development Index (2000)?
SQL: SELECT AVG("inegi_code") FROM queretaro_municipalities WHERE "population_density_km_2" < 81.4 AND "human_development_index_2000" = 0.6593