<human>: Does the sentence "After the conclusion of the NNPC's account Audit, it was announced in January 2015 that NNPC's non-remitted revenue is actually US$1.48billion, which it needs to refund back to the Government." answer the question "The state oil company NNPC was initially thought to owe how much to the government?"

OPTIONS:
- yes
- no
<bot>: no