What was the increase / (decrease) in the current ratio from 2018 to 2019?
{"Cash and cash equivalents": {"2019": 12395.0, "2018": 9599.0}, "Working capital (deficit)": {"2019": -67429.0, "2018": -85471.0}, "Current ratio": {"2019": 0.72, "2018": 0.7}}
current_ratio_2019 = df["Current ratio"]["2019"]
current_ratio_2018 = df["Current ratio"]["2018"]
answer = current_ratio_2019 - current_ratio_2018