What was the percentage change in the Total non-current trade and other payables in 2019 from 2018?
{"": {"31 March 2019": "$M", "31 March 2018": "$M"}, "Current -- Trade payables": {"31 March 2019": 35.8, "31 March 2018": 39.6}, "Current -- Accruals": {"31 March 2019": 46.6, "31 March 2018": 68.4}, "Current -- Social security and other taxes": {"31 March 2019": 12.7, "31 March 2018": 14.9}, "Current -- Other payables": {"31 March 2019": 7.1, "31 March 2018": 11.2}, "Current -- Total current trade and other payables": {"31 March 2019": 102.2, "31 March 2018": 134.1}, "Non-Current -- Other payables": {"31 March 2019": 10.1, "31 March 2018": 8.2}, "Non-Current -- Total non-current trade and other payables": {"31 March 2019": 10.1, "31 March 2018": 8.2}}
total_non_current_trade_2019 = df["Non-Current -- Other payables"]["31 March 2019"]
total_non_current_trade_2018 = df["Non-Current -- Other payables"]["31 March 2018"]
answer = (total_non_current_trade_2019 - total_non_current_trade_2018) / total_non_current_trade_2018 * 100.0