What is the change in current federal taxes between 2018 and 2019?
{"Current:                          -- Federal   ": {"2019": 18682, "2018": 22606, "2017": 53998}, "Current:                          -- State     ": {"2019": 5711, "2018": 6182, "2017": 6595}, "Current:                          -- Foreign     ": {"2019": 7323, "2018": 7018, "2017": 6185}, "Current:                          -- ": {"2019": 31716, "2018": 35806, "2017": 66778}, "Deferred:                          -- Federal     ": {"2019": -863, "2018": -3127, "2017": 1590}, "Deferred:                          -- State     ": {"2019": -326, "2018": -674, "2017": 35}, "Deferred:                          -- Foreign     ": {"2019": -212, "2018": -464, "2017": -51}, "Deferred:                          -- ": {"2019": -1401, "2018": -4265, "2017": 1574}, "Deferred:                          -- Total  ": {"2019": 30315, "2018": 31541, "2017": 68352}}
current_federal_2019 = df["Current:                          -- Federal   "]["2019"]
current_federal_2018 = df["Current:                          -- Federal   "]["2018"]
answer = current_federal_2019 - current_federal_2018