What is the change in gross profit from ASG from 2018 to 2019?
{"PSG": {"2019": 976.0, "2018": 1110.1}, "ASG": {"2019": 794.8, "2018": 878.3}, "ISG": {"2019": 275.4, "2018": 317.1}, "Gross profit for all segments": {"2019": 2046.2, "2018": 2305.5}, "Unallocated manufacturing costs (2)": {"2019": -72.6, "2018": -66.8}, "Total gross profit": {"2019": 1973.6, "2018": 2238.7}}
asg_2019 = df["ASG"]["2019"]
asg_2018 = df["ASG"]["2018"]
answer = asg_2019 - asg_2018