What is the percentage change in the net assets from 2018 to 2019?
{"Current assets": {"2019  $000": 75460, "2018  $000 RESTATED": 91457, "CHANGE": -18}, "Non-current assets": {"2019  $000": 150607, "2018  $000 RESTATED": 147234, "CHANGE": 2}, "Total assets": {"2019  $000": 226067, "2018  $000 RESTATED": 238691, "CHANGE": -5}, "Current liabilities": {"2019  $000": 34555, "2018  $000 RESTATED": 43336, "CHANGE": -20}, "Non-current liabilities": {"2019  $000": 34348, "2018  $000 RESTATED": 31418, "CHANGE": 9}, "Total liabilities": {"2019  $000": 68903, "2018  $000 RESTATED": 74754, "CHANGE": -8}, "Net assets": {"2019  $000": 157164, "2018  $000 RESTATED": 163937, "CHANGE": -4}, "Equity": {"2019  $000": 157164, "2018  $000 RESTATED": 163937, "CHANGE": -4}}
net_assets_2019 = df["Net assets"]["2019  $000"]
net_assets_2018 = df["Net assets"]["2018  $000 RESTATED"]
answer = (net_assets_2019 - net_assets_2018) / net_assets_2018 * 100.0