Between 1989 and 1992, Colombia went through an unprecedented period of change in economic policy and institutions.

While this didn't break any records, an unprecedented period of mild weather began around the middle of November.

This historically low dependency ratio has been extremely beneficial for China's unprecedented period of economic growth.

This unprecedented period of chaos and revolution, however, had introduced the world to a new movement and ideology that would soon crisscross the globe.

Q. Does this unprecedented period of prosperity herald a "new economy," or are you afraid that it's got to end pretty soon?

The bridge was part of the unprecedented period of bridge building in Portland during the 1920s.

In 2005, Bangladesh experienced an unprecedented period of continuous political instability.

The last few years have witnessed an unprecedented period of economic depression for Wales accompanied by massive youth unemployment.

Russia is a developed country that has lived through an unprecedented period of decline and degradation and is now trying to bounce back.

He guided the Y through an unprecedented period of growth and expansion and his legacy will endure.