Regarding your question about whether the proportion of treasury shares to the total number of shares outstanding is higher than the general level, I would agree that it is higher than average. (nintendonuggets.com)
Share buy - back by way of market acquisition and all shares purchased are held as treasury shares. (s-i2i.com)
The first involves issuing treasury shares: stock held by a company that can be transferred to third parties without approval from other investors. (breakingviews.com)