Table:
First issued | Design | Slogan | Serial format | Serials issued | Notes
1955 | White embossed digits with white border on black background; ARIZONA and last two digits of registration year embossed in white and centered at top between screw holes | GRAND CANYON STATE embossed in white and centered at bottom | A-12345 |  | Coded by county of issuance.
1958 | White embossed digits with white border on blue background; ARIZONA and last two digits of registration year embossed in white and centered at top between screw holes | GRAND CANYON STATE embossed in white and centered at bottom | ABC-123 | AAA-001 to BZZ-999 | 
1960 | Blue embossed digits with blue border on white background; ARIZONA and last two digits of registration year embossed in blue and centered at top between screw holes | GRAND CANYON STATE embossed in blue and centered at bottom | ABC-123 | CAA-001 to DZZ-999 | 
1963 | White embossed digits with white border on blue background; ARIZONA and last two digits of registration year embossed in white and centered at top between screw holes | GRAND CANYON STATE embossed in white and centered at bottom | ABC-123 | EAA-001 to FZZ-999 | 
1965 | Black embossed digits with black border on white background; ARIZONA and last two digits of registration year embossed in black and centered at top between screw holes | GRAND CANYON STATE embossed in black and centered at bottom | ABC-123 | HAA-001 to JZZ-999 | 
1968 | Black embossed digits with black border on yellow background; ARIZONA and last two digits of registration year embossed in black and centered at top between screw holes | GRAND CANYON STATE embossed in black and centered at bottom | ABC-123 | KAA-001 to NZZ-999 | 
1972 | Green embossed digits with green border on pale orange background; ARIZONA and last two digits of registration year embossed in green and centered at top between screw holes | GRAND CANYON STATE embossed in green and centered at bottom | ABC-123 | PAA-001 to WZZ-999 | 
1980 | White embossed digits with white embossed border on maroon background, with white embossed saguaro cactus dividing the letters and numbers; ARIZONA embossed in white and centered at top | GRAND CANYON STATE embossed in white and centered at bottom | ABC-123 | AAA-001 to NZZ-999 | 
1996 | Dark green embossed digits on screened background of purple mountains and cacti with white setting sun and sky fading from orange to white to turquoise at top; ARIZONA in wide plain dark green letters outlined in white and centered at top | GRAND CANYON STATE in dark green thin plain letters at bottom right in orange part of screen | 123·ABC | 101·AAA to 999·ZZZ | Awarded "Plate of the Year" for best new license plate of 1996 by the Automobile License Plate Collectors Association, the first time Arizona has been so honored.
2008 | Dark green screened digits on screened background of purple mountains and cacti with white setting sun and sky fading from orange to white to turquoise at top; ARIZONA in wide plain dark green letters outlined in white and centered at top; security stripe through center of plate | GRAND CANYON STATE in dark green thin plain letters at bottom right in orange part of screen | ABC1234 | AAA0001 to present |

Question: name the year of the license plate that has the largest amount of alphanumeric digits.
Answer: 2008

Question: which year featured the license plate with the least characters?
Answer: 1955

Question: what was year was the first arizona license plate made?
Answer: 1955

Question: what is the average serial format of the arizona license plates?
Answer: ABC-123