How has this year been as a family for you and the kids, about your reading list? There are no targets or cut-offs, but every year just make sure you increase it, even by a small margin, so you know you are on the right track!
To get your kids out of a reading slump- ease them into it, and watch them fall in love with the habit of reading. Let them read slowly, let them re-read their favourite books, let them savour the moment. The habit is all that matters.