pre_text: G. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment, net consisted of the following at December 31, 2019 and 2018: Depreciation of property, plant and equipment for the years ended December 31, 2019, 2018, and 2017 was $70.8 million, $67.4 million, and $66.1 million, respectively. As of December 31, 2019 and 2018, the gross book value included in machinery and equipment for internally manufactured test systems being leased by customers was $5.4 million and $5.5 million, respectively. As of December 31, 2019 and 2018, the accumulated depreciation on these test systems was $5.1 million and $5.2 million, respectively.
table: 2019 2018
table: (in thousands)
table: Land $16,561 $16,561
table: Buildings 107,282 105,935
table: Machinery, equipment and software 834,970 752,722
table: Furniture and fixtures 29,157 27,432
table: Leasehold improvements 59,378 52,536
table: Construction in progress 2,537 6,276
table: 1,049,885 961,462
table: Less: accumulated depreciation 729,669 681,641
table: $320,216 $279,821
question: Analyse this data from a financial earnings document. What was the change in the amount of Land from 2018 to 2019?