| year | Books |
| 1970-71 | 3059 |
| 1971-72 | 2264 |
| 1972-73 | 4115 |
| 1973-74 | 2892 |
| 1974-75 | 2237 |
| 1975-76 | 3864 |
| 1976-77 | 4982 |
| 1977-78 | 3025 |
| 1978-79 | 3364 |
| 1979-1980 | 3105 |
| 1980-81 | 3434 |
| 1981-82 | 6380 |
| 1982-83 | 3176 |
| 1983-84 | 2077 |
| 1984-85 | 1801 |
| 1985-86 | 1439 |
| 1986-87 | 1092 |
| 1987-88 | 617 |
| 1988-89 | 1826 |
| 1989-90 | 656 |
| 1990-91 | 355 |
| 1991-92 | 337 |
| 1992-93 | 460 |
| 1993-94 | 246 |
| 1994-95 | 796 |
| 1995-96 | 315 |
| 1996-97 | 489 |
| 1997-98 | 152 |
| 1998-99 | 207 |
| 1999-2000 | 324 |
| 2000-2001 | 550 |
| 2001-2002 | 4026 |
| 2002-2003 | 799 |
| 1953.364 |