What is the percentage change in revenue from term license between 2018 and 2019?
{"Term license": {"$133,746": 199433, "15%": 22, "82,627": 178256, "9%": 20, "$51,119": 21177, "62%": 12}, "Maintenance": {"$133,746": 280580, "15%": 30, "82,627": 263875, "9%": 30, "$51,119": 16705, "62%": 6}, "Subscription (1)": {"$133,746": 613759, "15%": 67, "82,627": 524758, "9%": 59, "$51,119": 89001, "62%": 17}, "Perpetual license": {"$133,746": 80015, "15%": 9, "82,627": 109863, "9%": 12, "$51,119": -29848, "62%": -27}, "Consulting": {"$133,746": 217609, "15%": 24, "82,627": 256960, "9%": 29, "$51,119": -39351, "62%": -15}, "": {"$133,746": 911383, "15%": 100, "82,627": 891581, "9%": 100, "$51,119": 19802, "62%": 2}}
term_license_2019 = df["Term license"]["$133,746"]
term_license_2018 = df["Term license"]["82,627"]
answer = (term_license_2019 - term_license_2018) / term_license_2018 * 100.0