Data source:
https://www.investing.com/indices/idx-composite-historical-data
https://www.google.com/finance/quote/IDXPROPERT:IDX?hl=en&window=MAX
https://support.google.com/docs/answer/3093281?hl=en
https://www.idx.co.id/id/produk/indeks
https://finance.yahoo.com/quote/JPYIDR%3DX/history/