Based on amortized cost, what is the percentage constitution of Agency securities among the total investments?
{"Debt Investments -- U.S. treasury securities": {"Amortized Cost": 52809, "Unrealized Gains": "$\u2014", "Unrealized Losses": -109, "Fair Value": 52700}, "Debt Investments -- Agency securities": {"Amortized Cost": 22097, "Unrealized Gains": "\u2014", "Unrealized Losses": -82, "Fair Value": 22015}, "Debt Investments -- Certificates of deposit and time deposits": {"Amortized Cost": 58824, "Unrealized Gains": "\u2014", "Unrealized Losses": "\u2014", "Fair Value": 58824}, "Debt Investments -- Commercial paper": {"Amortized Cost": 35372, "Unrealized Gains": "\u2014", "Unrealized Losses": "\u2014", "Fair Value": 35372}, "Debt Investments -- Corporate debt securities": {"Amortized Cost": 158538, "Unrealized Gains": 14, "Unrealized Losses": -669, "Fair Value": 157883}, "Debt Investments -- Total investments": {"Amortized Cost": 327640, "Unrealized Gains": 14, "Unrealized Losses": -860, "Fair Value": 326794}}
agency_securities_amortized_cost = df["Debt Investments -- Agency securities"]["Amortized Cost"]
total_investments_amortized_cost = df["Debt Investments -- Total investments"]["Amortized Cost"]
answer = agency_securities_amortized_cost / total_investments_amortized_cost * 100.0