On the year, some are less common than others, an undated one or a '76 dated would possibly bring a little more than say a 1977 Albanian. The '67 and '68 models are also known to have much better looking stocks, which could influence price slightly.
No one knows the true numbers, some have studied and researched. Some say many were destroyed by NATO or the UN Forces, other say some were shipped to a 3rd world country in trade for who knows what, they just vanished I guess.
The figures below are best guess based on serial surveys etc. The one thing the bottom chart does not figure in, bubba rifles 
, so there could be even less in original form remaining.(figures gathered and put together by Glen Burton)
Estimated production of Albanians
1967- 980
1968- 570
1969- 2800
1970- 2980
1971- 2620
1976- 160
1977- 660
1978- 4960
1979- 800
Undated- 420
Best guess is that, according to year produced, current world inventory may be:
1967- 320
1968- 180
1969- 970
1970- 1100
1971- 860
1976- 50
1977- 220
1978- 1850
Undated- 150
If you were to find one in, say the 400 range or better yet, less, run, don't walk, cause it will disappear once someone else starts sniffing around.
