What was the change in the Depreciation, amortization and disposals of long-lived assets from 2018 to 2019?
{"Reconciliation of Adjusted EBITDA: -- Net (loss) income ": {"2019": -7001, "2018": -12386, "2017": -5441, "2016": -3244, "2015": 285}, "Reconciliation of Adjusted EBITDA: -- Depreciation, amortization and disposals oflong-lived assets": {"2019": 29960, "2018": 19141, "2017": 11881, "2016": 10527, "2015": 11028}, "Reconciliation of Adjusted EBITDA: -- Rent expense related to build-to-suit facilities": {"2019": -4482, "2018": -785, "2017": "\u2014", "2016": "\u2014", "2015": "\u2014"}, "Reconciliation of Adjusted EBITDA: -- Interest expense (income), net  ": {"2019": 3425, "2018": -712, "2017": -242, "2016": 616, "2015": 641}, "Reconciliation of Adjusted EBITDA: -- Provision for income taxes  ": {"2019": 2001, "2018": 2705, "2017": 2202, "2016": 865, "2015": 152}, "Reconciliation of Adjusted EBITDA: -- Share-based compensation expense  ": {"2019": 25954, "2018": 11734, "2017": 10294, "2016": 7886, "2015": 5426}, "Reconciliation of Adjusted EBITDA: -- Impairments of long-lived assets  ": {"2019": "\u2014", "2018": 1712, "2017": "\u2014", "2016": "\u2014", "2015": "\u2014"}, "Reconciliation of Adjusted EBITDA: -- Restructuring  ": {"2019": -170, "2018": 832, "2017": "\u2014", "2016": "\u2014", "2015": 1203}, "Reconciliation of Adjusted EBITDA: -- Foreign exchange expense (income)  ": {"2019": 1647, "2018": 3511, "2017": -6892, "2016": -811, "2015": -4508}, "Reconciliation of Adjusted EBITDA: -- Acquisition-related expenses (1) (3)  ": {"2019": 2012, "2018": "\u2014", "2017": 655, "2016": "\u2014", "2015": "\u2014"}, "Reconciliation of Adjusted EBITDA: -- Gain on previously held asset (2)  ": {"2019": -338, "2018": "\u2014", "2017": "\u2014", "2016": "\u2014", "2015": "\u2014"}, "Reconciliation of Adjusted EBITDA: -- Litigation-related expenses (4)  ": {"2019": 1000, "2018": "\u2014", "2017": "\u2014", "2016": "\u2014", "2015": "\u2014"}, "Reconciliation of Adjusted EBITDA: -- Adjusted EBITDA": {"2019": 54008, "2018": 25752, "2017": 12457, "2016": 15839, "2015": 14227}}
depreciation_amortization_disposals_2019 = df["Reconciliation of Adjusted EBITDA: -- Depreciation, amortization and disposals oflong-lived assets"]["2019"]
depreciation_amortization_disposals_2018 = df["Reconciliation of Adjusted EBITDA: -- Depreciation, amortization and disposals oflong-lived assets"]["2018"]
answer = depreciation_amortization_disposals_2019 - depreciation_amortization_disposals_2018