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Debris discs are a consequence of the planet formation process and constitutethe fingerprints of planetesimal systems. Their solar system's counterparts arethe asteroid and Edgeworth-Kuiper belts. The aim of this paper is to providerobust numbers for the incidence of debris discs around FGK stars in the solarneighbourhood. The full sample of 177 FGK stars with d<20 pc proposed for theDUNES survey is presented. Herschel/PACS observations at 100 and 160 microncomplemented with data at 70 micron, and at 250, 350 and 500 micron SPIREphotometry, were obtained. The 123 objects observed by the DUNES collaborationwere presented in a previous paper. The remaining 54 stars, shared with theDEBRIS consortium and observed by them, and the combined full sample arestudied in this paper. The incidence of debris discs per spectral type isanalysed and put into context together with other parameters of the sample,like metallicity, rotation and activity, and age.  The subsample of 105 stars with d<15 pc containing 23 F, 33 G and 49 K stars,is complete for F stars, almost complete for G stars and contains a substantialnumber of K stars to draw solid conclusions on objects of this spectral type.The incidence rates of debris discs per spectral type 0.26 (6 objects withexcesses out of 23 F stars), 0.21 (7 out of 33 G stars) and 0.20 (10 out of 49K stars), the fraction for all three spectral types together being 0.22 (23 outof 105 stars). Uncertainties corresponding to a 95% confidence level are givenin the text for all these numbers. The medians of the upper limits ofL_dust/L_* for each spectral type are 7.8E-7 (F), 1.4E-6 (G) and 2.2E-6 (K);the lowest values being around 4.0E-7. The incidence of debris discs is similarfor active (young) and inactive (old) stars. The fractional luminosity tends todrop with increasing age, as expected from collisional erosion of the debrisbelts.

Incidence of debris discs around FGK stars in the solar neighbourhood