pre_text: The table below details the percentage of the number of investment properties subject to internal and external valuations during the current and comparable reporting periods The Group also obtained external valuations on 31 freehold investment properties acquired during the year ended 30 June 2019 (year ended 30 June 2018: 19 freehold investment properties). These external valuations provide the basis of the Directors’ valuations applied to these properties at 30 June 2019 and 30 June 2018. Including these valuations, 51% of freehold investment properties were subject to external valuations during the year (year ended 30 June 2018: 43% of freehold investment properties).
table: External valuation % Internal valuation %
table: Year ended 30 June 2019
table: Leasehold 23% 77%
table: Freehold 38% 62%
table: Year ended 30 June 2018
table: Leasehold 60% 40%
table: Freehold 27% 73%
question: Analyse this data from a financial earnings document. What was the change in the leasehold external valuation % from 2018 to 2019?