The mobile phone market continued growing rapidly between 1990 and 2005, with the number of subscribers increasing dramatically worldwide. By 2001, mobile service revenues exceeded costs and covered 85% of infrastructure expenses. Subscriber bases substantially increased in all major markets, with Asia reaching 215 million subscribers and Europe reaching 35 million subscribers by 2005. Mobile phone technology evolved so that phones became ubiquitous, with people carrying them all the time, including young adults taking phones to school.