| Interest Area | Undated or Forthcoming | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | Total |
| Economics | 0 | 5 | 6 (11) | 14 (25) | 24 (49) | 43 (92) | 50 (142) | 65 (207) | 75 (282) | 101 (383) | 71 (454) | 79 (533) | 63 (596) | 58 (654) | 72 (726) | 23 (749) | 1 (750) | 0 (750) | 0 (750) | 0 (750) | |
| Family | 0 | 6 | 5 (11) | 12 (23) | 26 (49) | 34 (83) | 36 (119) | 35 (154) | 54 (208) | 70 (278) | 50 (328) | 36 (364) | 54 (418) | 39 (457) | 35 (492) | 14 (506) | 0 (506) | 0 (506) | 0 (506) | 0 (506) | |
| Health | 0 | 8 | 5 (13) | 15 (28) | 33 (61) | 42 (103) | 44 (147) | 56 (203) | 68 (271) | 94 (365) | 69 (434) | 71 (505) | 101 (606) | 90 (696) | 68 (764) | 28 (792) | 0 (792) | 0 (792) | 0 (792) | 0 (792) | |
| Health Services | 0 | 1 | 1 (2) | 5 (7) | 8 (15) | 30 (45) | 20 (65) | 31 (96) | 46 (142) | 54 (196) | 43 (239) | 33 (272) | 44 (316) | 30 (346) | 43 (389) | 14 (403) | 0 (403) | 0 (403) | 0 (403) | 0 (403) | |
| Labor | 0 | 7 | 4 (11) | 9 (20) | 25 (45) | 25 (70) | 49 (119) | 49 (168) | 69 (237) | 74 (311) | 54 (365) | 64 (429) | 54 (483) | 44 (527) | 40 (567) | 0 (567) | 0 (567) | 0 (567) | 0 (567) | 0 (567) | |
| Methods | 0 | 11 | 4 (15) | 15 (30) | 33 (63) | 33 (96) | 33 (129) | 48 (177) | 62 (239) | 70 (309) | 41 (350) | 26 (376) | 35 (411) | 39 (450) | 30 (480) | 8 (488) | 0 (488) | 0 (488) | 0 (488) | 0 (488) | |
| Total | 0 | 38 | 25 | 70 | 149 | 207 | 232 | 284 | 374 | 463 | 328 | 309 | 351 | 300 | 288 | 87 | 1 | 0 | 0 | 0 | 3506 |