The proportion of existing mines in flabby middle-age is growing as the rate of discovery of new tier-one assets has slowed over recent years.

近年来因新的“核心”资产发现率已下降，现有矿山中处于江河日下的中等年龄的比例一直在上扬。

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The analysis on models showed that newness coefficient of agricultural machinery, proportion of new and old tractors are two important factors affecting on the intact rate of large medium tractors.

由模型分析可见，农机新度系数、大中型拖拉机的新旧结构比例是影响大中型拖拉机完好率的两大重要因素。

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Fresh data Thursday showed Greece's jobless rate rising to a new record in March, and with the proportion of young people without jobs now topping 50%.

WSJ: Greek Political Debate Turns Violent

Alltel also reported a record gain of 230, 000 new subscribers in the last quarter, and a record low churn rate, which measures the proportion of customers leaving the company each month, of 1.8%.

FORBES: Alltel To Go Private For Pricey $27.5B