What is the investments classified as cash equivalents as a percentage of the total investments in 2019?
{"Corporate debt securities and other": {"2019": 22242, "2018": 44302}, "Commercial paper debt securities": {"2019": "\u2014", "2018": 1647}, "Money market funds": {"2019": 5700, "2018": 6500}, "Total investments": {"2019": 27942, "2018": 52449}, "Investments classified as cash equivalents": {"2019": 10629, "2018": 6808}, "Investments classified as marketable securities": {"2019": 17313, "2018": 45641}}
cash_equivalents_2019 = df["Investments classified as cash equivalents"]["2019"]
total_investments_2019 = df["Total investments"]["2019"]
answer = (cash_equivalents_2019 / total_investments_2019) * 100.0