What was the difference between the amortized cost of debt investments that were within 1 year and after 1 year through 5 years?
{"Within 1 year": {"Amortized Cost": 6322, "Fair Value": 6324}, "After 1 year through 5 years": {"Amortized Cost": 12191, "Fair Value": 12218}, "After 5 years through 10 years": {"Amortized Cost": 1643, "Fair Value": 1687}, "After 10 years": {"Amortized Cost": 9, "Fair Value": 10}, "Mortgage-backed securities with no single maturity": {"Amortized Cost": 1425, "Fair Value": 1421}, "Total": {"Amortized Cost": 21590, "Fair Value": 21660}}
amortized_cost_after_1_year = df["After 1 year through 5 years"]["Amortized Cost"]
amortized_cost_within_1_year = df["Within 1 year"]["Amortized Cost"]
answer = amortized_cost_after_1_year - amortized_cost_within_1_year