CREATE TABLE table_54105 ("End of Fiscal Year" FLOAT, "Gross Debt in $Billions undeflated Treas." FLOAT, "as % of GDP Low-High" TEXT, "Debt Held By Public  ( $Billions ) " FLOAT, "as % of GDP  ( Treas/MW ,  OMB or OMB/MW ) " FLOAT, "GDP $Billions OMB/BEA est.=MW.com" TEXT)

For End of Fiscal Years past 1980 that also have as % of GDP Low-High of 83.4-84.4, and a Debt Held By Public ($Billions) smaller than 7,552 what would be the average Gross Debt in $Billions undeflated Treas. in said years?
SELECT AVG("Gross Debt in $Billions undeflated Treas.") FROM table_54105 WHERE "End of Fiscal Year" > '1980' AND "as % of GDP Low-High" = '83.4-84.4' AND "Debt Held By Public ($Billions)" < '7,552'
SELECT AVG("Gross Debt in $Billions undeflated Treas.") FROM "table_54105" WHERE "Debt Held By Public ($Billions)" < '7,552' AND "End of Fiscal Year" > '1980' AND "as % of GDP Low-High" = '83.4-84.4'