What is the percentage change in the value of the company's trademarks and tradenames between 2018 and 2019?
{"Trademarks and tradenames (Retail Segment)": {"September 2019": 500000, "September 2018": 3373269}, "ustomer relationships (Wholesale Segment) (less accumulated amortization of approximately $2.1 million at both September 2019 and September 2018)": {"September 2019": "\u2014", "September 2018": 41667}, "": {"September 2019": 500000, "September 2018": 3414936}}
trademarks_2019 = df["Trademarks and tradenames (Retail Segment)"]["September 2019"]
trademarks_2018 = df["Trademarks and tradenames (Retail Segment)"]["September 2018"]
answer = (trademarks_2019 - trademarks_2018) / trademarks_2018 * 100.0