user: Question: What is the decay for the sattelite with an id that is 1990-081C?
Columns: ['Satellite', 'Launch date (UTC)', 'Decay', 'Mass(kg)', 'Diameter(m)', 'NSSDC ID', 'Nation', 'Usage']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Echo 1', '1960-08-12 09:36:00', '1968-05-24', '180', '30.48', '1960-009A', 'US', 'pcr, ado, spc, tri']
SQL:

assistant: SELECT "Decay" FROM "Table" WHERE "NSSDC ID" = '1990-081C';