Table:
text: Outline of the Faroe Islands
Local government in the Faroe Islands
Local government in the Faroe Islands
Municipality Population Inhabitants_per_km² Area_in_km² Markatal Island Region
Sjóvar Kommuna 1.027 31 33 70 Eysturoy Southern Eysturoy
Leirvík 873 79 11 33 Eysturoy Southern Eysturoy
Sandavágur 797 13 61 48 Vágar Vágar
Hvalba 765 19 40 99 Suðuroy Suðuroy
Eiði 705 19 37 49 Eysturoy Northern Eysturoy
Kvívík 615 13 49 75 Streymoy Streymoy
Sandur 586 12 48 97 Sandoy Sandoy
Skopun 507 56 9 0 Sandoy Sandoy
Hvannasund 441 13 33 38 Viðoy and Borðoy Klaksvík
Sumba 383 15 25 64 Suðuroy Suðuroy
Viðareiði 339 11 30 48 Viðoy Norðoyggjar
Porkeri 333 24 14 37 Suðuroy Suðuroy
Skálavík 183 6 29 24 Sandoy Sandoy
Kunoy 157 4 35 65 Kunoy Norðoyggjar

Question: What is the average area (in km²) when Markatal is less than 0 for Outline of the Faroe Islands?

Question: What is the highest marka valley if the municipality is Leirvík and if inhabitants per km² are greater than 79 in Outline of the Faroe Islands?