What was the fair value of debt investments that had maturities within 1 year as a percentage of the total?
{"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}}
within_1_year_fair_value = df["Within 1 year"]["Fair Value"]
total_fair_value = df["Total"]["Fair Value"]
answer = within_1_year_fair_value / total_fair_value * 100.0