互联网普及率，统计术语。有以下两种表达供参考：

1、Internet penetration rate

Penetration：the extent to which a product is recognized and bought by customers in a particular market。（产品对市场的）渗透率，打进深度。

如：market penetration市场占有率

2、Internet availability rate

Availability：the fact that something can be bought, used, or reached, or how much it can be。可用性，可得性。

如：the availability of contraceptives 堕胎率

data base availability 数据库有效率

参考双语例句：

According to the International Telecommunications Union (ITU), Internet penetration in Viet Nam doubled between 2006 and 2011 while the number of mobile phone subscriptions per 100 inhabitants jumped from 22 to 143 during the same time period.

据国际电信联盟(ITU)称，与2006年相比，越南2011年的互联网普及率翻番，同期，移动电话用户数从每100户居民22部跃升至143部。

She explained that requests included in the handbook for information that was rarely or never supplied by the parties had been removed from the structures and commodities sections, such as potential market penetration of newly deployed alternatives and alternatives that may be used in the future to bring forward the estimated time when methyl bromide consumption could be reduced or eliminated; and that section 14 of the structures and commodities form on “use/ emission minimization measures” had been simplified.

她解释称，该手册的工厂设施和商品用途章节中删除了那些缔约方很少或从未回应的资料提供要求，如新公布的替代品和将来可能采用的替代品的潜在市场占有率信息，以便对减少或消除甲基溴消费量所需的时间做出估计；她还解释称，有关“尽量减少使用/排放的措施”的工厂设施和商品用途表第14部分得到了简化。

The reason behind the decline may be the fact that all readers have unlimited access to the collections of research libraries, as well as the widespread availability of the Internet, unlimited access to library databases, changes in the principles of gathering statistical data on libraries and the decline in the general population (in 2001 the population of Estonia was 1,366,959, in 2006 it was 1,344,684).

导致下降的背后原因可能是，所有读者都可以无限借阅研究图书馆的收藏品，因特网到处可上，图书馆数据库无限访问，有关图书馆的统计数据收集原则的变化以及全体人口的减少(2001年，爱沙尼亚的人口为1366959人；2006年，为1344684 人)。