Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| First issued | Design | Slogan | Serial format | Serials issued | Notes |
| --- | --- | --- | --- | --- | --- |
| 1913 | Red lettering and white background painted on porcelain-coated steel base | None | 12345 | unknown | Steel registration seal on right side between "N.J." and "13" |
| 1933 | Orange lettering embossed on black base | None | A12345 | unknown | County letter code at left |
| 1947 | Blue on straw | None |  |  |  |
| 1951 | White on black | None |  |  |  |
| 1952-56 | Orange lettering embossed on black base | None | A/B 123; A/B 12C; A/B 1C2; A/B C12; A/B 1234 | unknown | Tab for subsequent years inserted over original date |
| 1959 | black on buff, non-reflective, N.J. embossed in wide block font above numbers | GARDEN STATE embossed in plain block letters below numbers | ABC-123 | AAA-100 to RHZ-9991, 2 |  |
| 1960 | black on buff, non-reflective, Contr. Equip. embossed in wide block font above numbers | IN TRANSIT embossed in plain block letters below numbers | F-86-3 | F-11-3 TO F-99-31, 2, 5 | FROM THE COLLECTION OF RICHARD WATSON |
| 1969-1970 | black on buff, non-reflective, N.J. embossed in wide block font above numbers | GARDEN STATE embossed in plain block letters below numbers | ABC-123 | RIA-100 to SZZ-9991, 2, 5 |  |
| 1970 | black on buff, non-reflective, N.J. embossed in wide block font above numbers | GARDEN STATE embossed in plain block letters below numbers | ABC-123 | UAA-100 to YZZ-9991, 2, 5 |  |
| 1973 | black on buff, non-reflective, N.J. embossed in wide block font above numbers | GARDEN STATE embossed in plain block letters below numbers | 123-ABC | 100-AAA to 999-HBZ1, 2, 5 |  |
| 1977 | black on buff, non-reflective, NEW JERSEY embossed in plain block font above numbers | GARDEN STATE embossed in plain block letters below numbers | 123-ABC | 100-HCA to 999-KZZ1, 2, 5 |  |
| 1979 | yellow on blue, non-reflective, NEW JERSEY embossed in plain block font above numbers | GARDEN STATE embossed in plain block letters below numbers | 123-ABC; New Jersey state icon used as dash | 100-LAA to 999-ZZZ1, 2, 5 |  |
| 1985 | yellow on blue, non-reflective, NEW JERSEY embossed in plain block font above numbers | GARDEN STATE embossed in plain block letters below numbers | ABC-123; New Jersey state icon used as dash | ZAA-100 to ZZZ-9992, 3, 5 |  |
| 1985 | yellow on blue, non-reflective, NEW JERSEY embossed in plain block font above numbers | GARDEN STATE embossed in plain block letters below numbers | ABC-12D; New Jersey state icon used as dash | AAA-10A to HZZ-99Z2, 3, 5 |  |
| 1992 | black embossed numbers on yellow to white gradient, reflective; New Jersey screened in black plain serifed font above numbers; black outlines for registration stickers at top corners | Garden State screened in black plain block letters below numbers | ABC1234; New Jersey state icon used as dash | AAA1000 to ADJ99993, 4, 5 |  |
| 1993 | black embossed numbers on yellow to white gradient, reflective; New Jersey screened in black plain serifed font above numbers; black outlines for registration stickers at top corners | Garden State screened in black plain block letters below numbers | AB-123D; New Jersey state icon used as dash | BA-100A to ZZ-999Z 3, 4, 5 |  |
| 1999 | black embossed numbers on yellow to white gradient, reflective; New Jersey screened in black plain serifed font above numbers; black outlines for registration stickers at top corners | Garden State screened in black plain block letters below numbers | ABC-12D; New Jersey state icon used as dash | JAA-10A to VZT-99Z 3, 4, 5 |  |
| 2007 | black embossed numbers on yellow to white gradient, reflective; New Jersey screened in black plain serifed font above numbers | Garden State screened in black plain block letters below numbers | ABC-12D; New Jersey state icon used as dash | VZU-10A to ZZZ-99Z 3, 4, 5 | Security threads added to vertical center of plate somewhere in the Z series |
| 2010 | black embossed numbers on yellow to white gradient, reflective; New Jersey screened in black plain serifed font above numbers; security threads added to plate | Garden State screened in black plain block letters below numbers | A12-ABC; New Jersey state icon used as dash | A10-AAA to present 4, 5 | K43-ECG (current highest series known on 03-26-2014) |
Question:
how many license plates were issued before 1960?
Answer:
6