What's been happening with my credit card

I have one personal credit card. The following chart shows the amounts I've been charging to it for the past 12 months. I do not like the trend. The bill for May is missing. October includes an impulse buy of approximately $1600 in one Montreal lingerie shop. November includes a car repair for $2000. I am in the habit of paying the entire amount off monthly.

Update, December 9:
I found May: $3312.