GRONI forbids the download of images from the site, and has disabled ability to right click and save. However, it might be worth knowing that it is possible to save the images - though whether you do so, against the express mighty wishes of GRONI, is completely up to you!
Using Firefox, you can load the image on the screen of interest, and then in Tools, select Page Info and then Media - the image appears then (with other images from the page, logos etc), and you can simply select and save - in file format box you need to save as All images, not HTML, and you need to add a picture file extension, eg. png to the file name, instead of .htm. No idea if the same can be done on other browsers, got this as a tip from a reader on my British GENES blog.
Also, to do searches for a single year - simply type in the year of interest in the first year box only.
Chris