What was the percentage change in non-current assets between 2018 and 2019?
{"Balance sheet -- Current assets": {"2019": 64507, "2018": 172554}, "Balance sheet -- Non-current assets": {"2019": 1300065, "2018": 1392710}, "Balance sheet -- Current liabilities": {"2019": -496029, "2018": -278728}, "Balance sheet -- Non-current liabilities": {"2019": -418578, "2018": -842786}}
non_current_assets_2019 = df["Balance sheet -- Non-current assets"]["2019"]
non_current_assets_2018 = df["Balance sheet -- Non-current assets"]["2018"]
answer = (non_current_assets_2019 - non_current_assets_2018) / non_current_assets_2018 * 100.0