a hefty year-on-year increase of的用法和样例：
- The number of couples getting married also increased last year, with 9.45 million marriages registered nationwide, an increase of 1.2 million year on year, the report said.
- The dead are burried in the desert year on year.
- Spending has increased year on year.
- A hefty serving of mashed potatoes; received a hefty bonus.
- The film also contains a hefty dose of comedy.