Writing?

Could you help me to check my writing assignment? does it have anything wrong? Thanks in advanced

My assignment:

The line graph illustrates the number of tourists travelling to a Caribbean island during the period from 2010 to 2017. Overall, despite the fluctuation in the quantity of visitors staying on cruise and those staying on island, the total visitors consistently increased for seven years.

From 2010 to 2012, the total visitors rose from 1 million to 1.5 million. During the period from 2010 to 2012, the quantity of visitors staying on the island remained stable 0.75 million at the first year before growing sharply at 1.25 in 2012, while the number of visitors staying on cruise ships only increased slightly at 0.5 million in 2011 and then decreased dramatically at 0.25 million in 2012.

Throughout the period from 2012 to 2016, the total visitors increased considerably from 1.5 million to 2.75 million. Visitors staying on the island increased and stabilized at 1.5 million from 2013 to 2015 before showing a downward trend in 2016 which was at 1.25. In comparison, the quantity of visitors staying on cruise ships showed an upward trend from 0.25 million in 2012 to 1.5 million in 2016.

From 2016 to 2017, the number of visitors staying on cruise ships climbed substantially to 2 million and higher than those staying on island although there was a slight increase of tourists on island making up from 1.25 million to 1.5 million.