Please help me review my Writing (and give an estimate band if possible)

Hi, I'm going to take the ielts exam in 6 days. I hope that you can estimate my band in writing, thank you very much!

The graph shows the number of marriages and divorces in the UK between 1975 and 2000.

The line graph gives information of the number of marriage and divorce cases in the United Kingdom between the period of 25 years from 1975 to 2000.

A quick glance at the graph reveals two obvious patterns: the number of the second marriages and the divorces were roughly equivalent with each other while the number of the first and total marriages shared the same trend.

In 1975, the divorce cases were under 100.000, which was approximately two third of the number of the second marriages. From then on, those two figures moved in line with each other for an uptrend until 1990, the number of divorces and the second marriages were equal, at about 220.000 instances. However, at the end point of the period, the figure for the second marriages slightly surpassed the divorces one, reaching roughly 250.000 cases.

The number of first marriages was higher than that of the aforementioned figures and its overall trend was also pretty similar to the total number of marriages in the UK. From 1975 to 1985, these figures witnessed an increase, reaching the peak with nearly 400.000 and 640.000 respectively. After that point, these numbers started to decrease gradually. In 2000, the number of first marriages was only 300.000, equivalent to about half of the total marriages.