Table:
text: Vehicle registration plates of Vermont
Passenger baseplates
1967 to present
First_issued Design Slogan Serial_format Serials_issued Notes_
1957-65 (odd years only) Embossed white on forest green with uncolored border line; VERMONT embossed in plain block letters centered below numbers, with last two digits of registration year in similar font at bottom right SEE embossed in same letters as VERMONT, at lower left 12345 (rounded numbers)  Alternated with white plates from 1957 to 1966
1958-66 (even years only) Embossed forest green on white with uncolored border line; VERMONT embossed in plain block letters centered below numbers, with last two digits of registration year in similar font at bottom right SEE embossed in same letters as VERMONT, at lower left 12345 (rounded numbers) , A1234 (1962 only)  Alternated with forest green plates from 1957 to 1966

text: Vehicle registration plates of Vermont
Passenger baseplates
1967 to present
First_issued Design Slogan Serial_format Serials_issued Notes_
1958-66 (even years only) Embossed forest green on white with uncolored border line; VERMONT embossed in plain block letters centered below numbers, with last two digits of registration year in similar font at bottom right SEE embossed in same letters as VERMONT, at lower left 12345 (rounded numbers) , A1234 (1962 only)  Alternated with forest green plates from 1957 to 1966
1967 Embossed white on green with border line; VERMONT embossed in plain block letters centered below numbers, with last two digits of registration year in similar font at bottom right None 1234 , A-1234 , 1234-A  Color changed from forest green to the kelly green used today
1969 Embossed white on green with border line; VERMONT embossed in plain block letters centered below numbers; registration sticker at bottom right corner SEE embossed in lower left corner 1234 , A-1234 , 1234-A  SEE returned to plate

text: Vehicle registration plates of Vermont
Passenger baseplates
1967 to present
First_issued Design Slogan Serial_format Serials_issued Notes_
1972 Embossed white on green with border line; VERMONT embossed in plain block letters centered above numbers; registration sticker at bottom left corner SEE embossed in top left corner A-1234 , 1234-A , AB-123 , A123B  
1976 Embossed white on green with border line; VERMONT embossed in plain block letters centered below numbers; white circle embossed to lower left; registration sticker at lower right GREEN MOUNTAINS embossed in thin block letters centered above numbers A-1234 , 1234-A , AB123 , 123AB  
1977 Embossed white on green with beveled edge and white rectangular box around numbers; Vermont in white stylized font screened above white box, with white sugar maple in upper left corner; registration sticker at lower right corner Green Mountain State screened in white plain serifed font centered below white box 123A4 (rounded numbers)  
1985 Embossed white on green with beveled edge and white rectangular box around numbers; Vermont in white stylized font screened above white box, with white sugar maple in upper left corner; registration sticker at lower right corner Green Mountain State screened in white plain serifed font centered below white box 1A234 , 123A4 , 1AB23 , 12AB3 , ABC 123 , 123A456 (more rectangular numbers than previous set) 1A100 to 9Y999 , 100A1 to 999Y9 , 1AA00 to ?F?99 , 00AA1 to 99??9 , AAB 100 to present , 100A100 to present The 1AA series never reached 1GA , Currently, the letters I, J, O, Q, U, V and Z are not in regular use. , The 100A100 series are new truck plates issued starting in mid-2009.

Question: How many different passenger vehicle registration base plates were used in Vermont?