Five things plummeting these days

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Most of all, oil price has been plummeting continuously, which is good news for driver.

>>Correct [OR: good news for drivers]

But oil refinery companies have been suffered from decline of their revenue.
>>But oil refinery companies have been suffering from the decline of their revenue.
The population of our city have also been dropped for years so that there is a concern about that it can be even below 290,000 from top 330,000 not long after.

>> The population of our city has also dropped for years, so there is a concern about that. It can even be below 290, 000 from top 330, 000 not long after.

Thus increaing population is number one policy for mayor who emphasizes to come up with ideas to incease the population.
>>Correct [spelling check: increasing; increase]
Rest things except above include value of Japanese yen, rate of Chinese economic growth, and Samsung\'s market share in mobile phone sales.

>>The rest of the things other than those mentioned above include Japanese yen, rate of Chinese economic growth, and Samsung\'s market share in mobile phone sales.