A divorce from the bonds of matrimony shall be decreed in favor of the innocent party for any of the following causes:
RSA 458:7
RS 148:3. CS 157:3. GS 163:3. GL 182:3. PS 175:5. PL 287 :6. 1938, 4:1. RL 339:6. RSA458:7. 1957, 67:1. 1999, 198:1, eff. Jan. 1, 2000.