What was the percentage change in total equity investments from 2018 to 2019?
{"Equity investments with readily determinable fair value: -- Enphase Energy, Inc": {"December 29, 2019": 173908, "December 30, 2018": 36225}, "Equity investments with readily determinable fair value: -- Total equity investments with readily determinable fair value": {"December 29, 2019": 173908, "December 30, 2018": 36225}, "Equity investments without readily determinable fair value: -- Project entities": {"December 29, 2019": 2677, "December 30, 2018": 2951}, "Equity investments without readily determinable fair value: -- Other equity investments without readily determinable fair value": {"December 29, 2019": 5859, "December 30, 2018": 5859}, "Equity investments without readily determinable fair value: -- Total equity investments without readily determinable fair value": {"December 29, 2019": 8536, "December 30, 2018": 8810}, "Equity investments with fair value option: -- SunStrong Capital Holdings, LLC": {"December 29, 2019": 8000, "December 30, 2018": 8831}, "Equity investments with fair value option: -- SunStrong Partners, LLC": {"December 29, 2019": 9500, "December 30, 2018": "\u2014"}, "Equity investments with fair value option: -- 8point3 Solar Investco 3 Holdings, LLC": {"December 29, 2019": "\u2014", "December 30, 2018": "\u2014"}, "Equity investments with fair value option: -- Total equity investment with fair value option": {"December 29, 2019": 17500, "December 30, 2018": 8831}, "Equity method investments -- Huansheng Corporation": {"December 29, 2019": 26533, "December 30, 2018": 32784}, "Equity method investments -- Project entities": {"December 29, 2019": 125, "December 30, 2018": 2044}, "Equity method investments -- Total equity method investments": {"December 29, 2019": 26658, "December 30, 2018": 34828}, "Equity method investments -- Total equity investments": {"December 29, 2019": 226602, "December 30, 2018": 88694}}
total_equity_investments_2019 = df["Equity method investments -- Total equity investments"]["December 29, 2019"]
total_equity_investments_2018 = df["Equity method investments -- Total equity investments"]["December 30, 2018"]
answer = (total_equity_investments_2019 - total_equity_investments_2018) / total_equity_investments_2018 * 100.0