Here are some more French Open stats, from a post by Dedans Penthouse in Feb:
Things got so bad financially, that the French Open was actually called The Vanaos Open in 1972 as the French Tennis Federation took 350,000 francs from a cosmetics company for the right to rename it The Vanaos Open. Fortunately, they only sold their soul to the corporate devil for one year and the tourney regained its rightful name.
The attendence for the entire 2 weeks in 1972 totalled only 51,101 which over 14 days translates to a shockingly few 3,650 people on average per day
The site itself in the early 1970's was only 3.25 hectares (8 acres) and contained...get this: FIVE COURTS. (today it is 8 acres containing 20 courts).