The radial velocities of \sim 1800 nearby Sun-like stars are currently being monitored by eight high-sensitivity Doppler exoplanet surveys .
Approximately 90 of these stars have been found to host exoplanets massive enough to be detectable .
Thus at least \sim 5 \% of target stars possess planets .
If we limit our analysis to target stars that have been monitored the longest ( \sim 15 years ) , \sim 11 \% possess planets .
If we limit our analysis to stars monitored the longest and whose low surface activity allow the most precise velocity measurements , \sim 25 \% possess planets .
By identifying trends of the exoplanet mass and period distributions in a sub-sample of exoplanets less-biased by selection effects , and linearly extrapolating these trends into regions of parameter space that have not yet been completely sampled , we find at least \sim 9 \% of Sun-like stars have planets in the mass and orbital period ranges M { sin } i > 0.3 M _ { Jupiter } and P < 13 \mbox { years } , and at least \sim 22 \% have planets in the larger range M { sin } i > 0.1 M _ { Jupiter } and P < 60 \mbox { years } .
Even this larger area of the log mass - log period plane is less than 20 \% of the area occupied by our planetary system , suggesting that this estimate is still a lower limit to the true fraction of Sun-like stars with planets , which may be as large as \sim 100 \% .