What is the change in Philippine Peso Buy position from year ended December 31, 2018 to 2019?
{"Japanese Yen": {"Notional Amount": 49.8, " Notional Amount": 29.9}, "Philippine Peso": {"Notional Amount": 36.4, " Notional Amount": 30.1}, "Malaysian Ringgit": {"Notional Amount": 20.4, " Notional Amount": "\u2014"}, "Chinese Yuan": {"Notional Amount": 20.2, " Notional Amount": 20.4}, "Korean Won": {"Notional Amount": 18.1, " Notional Amount": 20.8}, "Czech Koruna": {"Notional Amount": 11.9, " Notional Amount": 9.2}, "Euro": {"Notional Amount": "\u2014", " Notional Amount": 13.1}, "Other currencies - Buy": {"Notional Amount": 21.9, " Notional Amount": 26.3}, "Other currencies - Sell": {"Notional Amount": 4.6, " Notional Amount": 7.5}, "": {"Notional Amount": 183.3, " Notional Amount": 157.3}}
philippine_peso_notional_amount = df["Philippine Peso"]["Notional Amount"]
answer = philippine_peso_notional_amount - df["Philippine Peso"][" Notional Amount"]