Don
If you are enough of a computer wonk and anorak to consider doing it, Excel spreadsheets are a marvellous way of planning without hassle.
Once you’ve set them up in Year 1, you can make a file copy and change individual cells at will in a few seconds flat if you choose to change things in subsequent years.
I just did it with potatoes last year and my new plan for 2015 took me 5 minutes, changing a few strains and the balance between pot-grown and soil-grown.