producer price index造句怎么写

Due to the price surges of crude oil, raw coal, and steel products, China's producer price index (PPI) rose by 6.6% over the same period of last year in February, hitting a 3-year high.

The economy's producer price index was in negative territory for more than four consecutive years to August.

The producer price index, a gauge of ex-factory prices, rose 6.8% in April from a year earlier, higher than March's 5.9% rise and above the poll's median forecast of a 6.5% rise.