instances of year-over-year debt pay down

[m@lyshka]

Пожалуйста, помогите перевести.
instances of year-over-year debt pay down в предложении:
However, while consumer borrowing has spiked to new heights, there have only been three instances of year-over-year debt pay down since the 1970s, and NONE since 1998/1999.
Выражение встречается в следующем контексте:
The average debt load being carried by the U.S. consumer/household has also exploded, as home-owners have extracted the majority of their paper wealth reflation via home equity loans. The average single-family mortgage debt has spiked to more than $300,000.
Consumers have expanded their borrowing via direct lending by commercial banks. However, while consumer borrowing has spiked to new heights, there have only been three instances of year-over-year debt pay down since the 1970s, and NONE since 1998/1999.

Заранее спасибо

[foxtrot]

три случая выплаты/погашения годов задолженности?

[m@lyshka]

Скорее всего. Спасибо