"Why do women file for (initiate) divorce more often that men?" (paraphrased) I will provide my thoughts, because you posted this question more than once so far, and no one has bitten yet.
Based on my personal non-scientific experience:
1) Although women might have affairs at the similar frequency to men, they tend not to like to lie to their mates or be comfortable with it and may "come clean" with initiating divorce (an affair may be a result of a relationship that has all but formally ended). Men, meanwhile, may be able to "compartmentalize" affairs and extra-marital relationships and continue to have satisfying (to them) marriages. Based on small sample personal observations, anyway.
IMO, that is not the main reason, however:
2) Women tend to either earn less, or take on roles where they earn less, often because of child rearing or trailing spouse factors. Whoever earns more has a great financial disincentive to divorce when the other spouse is not able to support themselves. For many people, this is doubly true if they have taken religious vows to love and support their spouse -- how can you leave them to fend for themselves when you vowed to ensure that they are cared for, for life? In this financial case, it can be logical to hold on longer to try to make it work out, as there is no or minor benefit to divorce. Also, the primary income earner may be spending many hours outside of the home working, so having a difficult married life does not need to affect the majority of their day or mind, in the same way that it could for a stay at home spouse.
This is IMO -- I say #2 because during a rough patch in my relationship, requiring to provide spousal support for many years was a distinct disincentive to divorce. At least while married, my spouse would provide child care some of the time...and I had no risk of losing child custody, and I had no interest in looking for other relationships because work hours were so long and tiring, so it was easier to just stay married for a while, or until the kids were older. (Glad I did, because we got through all that).
#2) is actually a gender neutral motivation. The only reason it is skewed to women is that married women who get divorced, often have trailing spouse scenarios, or children, that reduces their income, more often then men do in your sample. I believe this trend is changing, but likely your sample covers years past.