Please help me correct this IELTS Task 1

The line chart showed the changes of yearly spendings on cell phone, national fixed-line, and international fixed-line services over a decade from 2001 to 2010 in the Unites States.

In general, there was a significant decrease of mean annual expenditure on national fixed-line services over 10 years. The opposite was true for the cost spent for mobile phones as the same time. Meanwhile, the budget that the U.S. residents paid for international landline communication remained relatively stable standing at approximately $300 a year.

In the first five years starting from 2001, it is notable that the yearly spending on national fixed-line phones stood at a predominant place compared to that of cellphone services ($700 versus $200, respectively). While there was a gradual fall of domestic fixed-line services, the average expense for portable devices witnessed a remarkable increase which equalise the threshold of $500 occupied by the national landline services in 2006.

During the second half of the decade, the figure revealed the considerably rising budget for mobile services concurrently with the continued drop of average spending for the U.S inland fixed-line services. Both of means of communication experienced their peak and bottom in 2010 (over $700 for cellphones versus $400 for landlines, respectively). Besides, the expense for international fixed-line facility demonstrated a small fluctuation on the first half before attaining a nearly fixed rate at $300 per year on the latter period.