What is the increase/ (decrease) in Benefits from tax holidays from December 31, 2018 to 2019?
{"Income tax benefit (expense) computed at statutory rate": {"Year ended December 31, 2019": -297, "Year ended December 31, 2018": -353, "Year ended December 31, 2017": -238}, "Non-deductible and non-taxable permanent differences, net": {"Year ended December 31, 2019": 4, "Year ended December 31, 2018": 45, "Year ended December 31, 2017": 17}, "Income (loss) on equity-method investments": {"Year ended December 31, 2019": "\u2014", "Year ended December 31, 2018": "\u2014", "Year ended December 31, 2017": "\u2014"}, "Valuation allowance adjustments": {"Year ended December 31, 2019": 2, "Year ended December 31, 2018": 141, "Year ended December 31, 2017": 92}, "Effect on deferred taxes of changes in enacted tax rates": {"Year ended December 31, 2019": 14, "Year ended December 31, 2018": -62, "Year ended December 31, 2017": -70}, "Current year credits": {"Year ended December 31, 2019": 50, "Year ended December 31, 2018": 43, "Year ended December 31, 2017": 40}, "Other tax and credits": {"Year ended December 31, 2019": -51, "Year ended December 31, 2018": -20, "Year ended December 31, 2017": -36}, "Benefits from tax holidays": {"Year ended December 31, 2019": 129, "Year ended December 31, 2018": 135, "Year ended December 31, 2017": 114}, "Net impact of changes to uncertain tax positions": {"Year ended December 31, 2019": -5, "Year ended December 31, 2018": -16, "Year ended December 31, 2017": -43}, "Earnings of subsidiaries taxed at different rates": {"Year ended December 31, 2019": -2, "Year ended December 31, 2018": -9, "Year ended December 31, 2017": -19}, "Income tax benefit (expense)": {"Year ended December 31, 2019": -156, "Year ended December 31, 2018": -96, "Year ended December 31, 2017": -143}}
benefits_2019 = df["Benefits from tax holidays"]["Year ended December 31, 2019"]
benefits_2018 = df["Benefits from tax holidays"]["Year ended December 31, 2018"]
answer = benefits_2019 - benefits_2018