The world’s richest person, Elon Musk, is ending the week $80 billion poorer, extending a wealth wipeout that began in mid-June after he became the world’s first trillionaire.

Musk started the week with a net worth of $792 billion, according to the Bloomberg Billionaires Index.

By Friday afternoon, his fortune had fallen to $712.5 billion, based on Forbes estimates.

That marks an $80 billion decline in just one week.

Tesla Inc. (NASDAQ:TSLA) accounts for only part of the damage.