The phrase "exemplifies the trend" is correct and it can be used in written English.
Depending on the context of what you are trying to communicate, you can use this phrase to introduce an example that demonstrates a particular trend. For example, "The drastic rise in online shopping exemplifies the trend of increased digital consumption."
The time series for the Netherlands exemplifies the trend of changing GD in LE, which rose from 3.4 years in 1955/59 to a maximum of 6.9 years in 1980/84 and then continuously declined to 4.3 years in 2005/09.
HCA exemplifies the trend.
Indeed, his success exemplifies the trend of talented young athletes maturing earlier and earlier.
Yamanashi prefecture south-west of Tokyo, a place of peach orchards and factories making industrial robots, exemplifies the trend.
He makes the case that hospital outsourcing exemplifies the trend towards "low-road" service-sector jobs that threatens to undermine society's social health, as well as the physical health and well-being of patients in health care settings globally.
The rise in the United States of Donald Trump, a man not known for his fidelity to facts and who breezily dismisses expert opinion, exemplifies the trend on the other side of the Atlantic.
The tiny appliance is pricey, about $100 more than simple home fire alarms, but it exemplifies the trends toward home technology in 2013 -- smart, connected, fun, possibly useful, but on some level a little baffling.
Exemplifying the trend, Intel, normally a debt-adverse firm, this week issued more than $6 billion, much of which will be used to buy back shares.
Few companies exemplify the trend toward interactivity better than Insight, the nation's ninth-largest cable operator, which has introduced such systems to its 1.4 million customers, most of whom live in Kentucky, Indiana, Ohio and Illinois.
