SemGroup|1965|1966|1967|1968|1969|1970|1971|1972|1973|1974|1975|1976|1977|1978|1979|1980|1981|1982|1983|1984|1985|1986|1987|1988|1989|1990|1991|1992|1993|1994|1995|1996|1997|1998|1999|2000|2001|2002|2003|2004|2005|2006|2007|
Activities & Behaviors|1664|9671|14150|25066|28075|26206|27869|37776|36346|41160|44730|42186|41976|44528|56946|46020|44415|47863|53994|56529|60969|63546|62054|65794|83012|82112|88525|104800|98361|107847|117732|130120|142468|142551|137773|136278|143204|179214|194559|216341|223526|250647|237673|
Anatomy|9331|75170|106900|158074|193770|194348|193104|244132|233741|257332|274071|247133|235494|207276|228011|234308|253361|260723|279171|282612|290009|295079|274267|275734|327351|315100|328641|363891|328303|337909|354954|513437|427712|491884|390362|417582|401942|412035|527156|526581|453460|470883|429446|
Chemicals & Drugs|27557|238962|367064|517937|616332|603179|605993|806774|759952|837743|869563|790573|775287|646928|710394|760620|835524|908007|964840|990902|1054295|1092408|1028300|1052805|1256434|1262262|1348461|1508241|1385265|1445803|1566100|2171369|1965034|2144926|1888449|1958249|2077934|2048554|2331934|2408939|2310249|2237640|2100538|
Concepts & Ideas|2904|20062|31339|78368|109194|103266|106918|142111|142402|166414|164975|152544|147866|137564|168446|162249|160405|175572|189403|195380|210162|217235|201560|213716|269745|293517|330235|390986|380571|418051|459033|495444|563813|532959|564271|556216|622665|673832|750655|836159|855872|913177|882601|
Devices|652|3724|5077|9093|10209|10086|9500|12710|13055|13648|14539|13489|13349|13619|13345|14289|13712|14354|15701|16014|16881|17662|15554|15565|19109|20855|20993|24416|20754|22706|23211|30483|29139|29566|26958|24571|29920|32585|38701|42760|43090|48645|51104|
Disorders|23273|151716|186386|307718|347020|345692|333979|370190|348779|369299|380489|367565|362474|325916|338804|344240|385534|391318|424319|430666|448470|459862|429908|432030|511632|494933|504864|555859|495139|521903|546546|991639|659184|882356|617986|700536|649834|726961|948345|898598|802574|868675|818503|
Genes & Molecular Sequences|26|462|948|1815|2292|2599|2968|4577|4475|5086|5973|5429|5764|5175|6425|6575|8209|9314|12665|14746|15165|16903|21985|31402|42836|57195|71070|87737|93658|107730|116784|108256|97346|85313|87111|83641|89686|80993|85922|97932|96533|98680|88319|
Geographic Areas|2600|16690|19618|28494|34523|30154|29400|34191|32431|40980|41879|43952|41398|46079|47053|49019|41481|45408|48474|48398|50225|49780|50883|53645|65446|61711|67224|73659|69882|71535|79495|108477|87925|86159|88611|85177|90588|106954|107828|120627|120481|130512|123702|
Living Beings|50228|343859|395514|546304|601586|584509|545606|629515|577654|618685|677388|720523|716745|677485|708186|736591|832468|851784|927803|934464|955611|980766|965762|976853|1184697|1129236|1149128|1264808|1154928|1204347|1273368|1388116|1545620|1437719|1456335|1421777|1513154|1593861|1708545|1824249|1845055|1979038|1840750|
Objects|1140|8058|11897|18157|22846|22516|22298|28279|26463|30019|29255|26446|25819|26114|28459|27199|26964|27029|32167|32112|32739|33718|31783|33300|37545|37727|37926|44093|38278|39710|42663|63841|53323|62478|52728|56954|59044|67598|86365|88081|84313|91723|92492|
Occupations|4797|34374|37700|51067|55268|47808|51847|50217|42217|49987|45250|45054|41827|39626|41878|43320|38981|40405|43989|42506|45947|44683|42214|42369|50014|45311|46486|52699|48369|49756|55679|219502|64311|103250|61844|76951|65842|86380|116821|122664|97693|109671|110375|
Organizations|612|4248|5491|8502|10448|9394|9193|11167|10949|13095|12687|11657|12728|17201|22051|17623|15455|14768|17130|17295|18126|18844|19568|20196|23070|22734|22901|27644|25421|25355|27632|32822|29394|34028|28936|28316|27021|34620|39896|40572|35531|38672|35422|
Phenomena|1397|11206|18556|31037|38339|40323|41759|61449|53061|60436|61498|54564|47120|40200|45839|46061|46005|46860|50511|52269|54825|57534|52205|55184|66304|66692|70180|80333|71099|74916|81707|106494|101275|109756|100551|106273|118782|128759|149773|161472|163840|175292|178632|
Physiology|6591|41875|67974|117317|145239|139348|147339|188442|178165|192730|193654|183013|173532|151289|167612|169202|178438|187688|201423|204711|214184|218499|204344|206701|253346|253693|270774|303264|278582|294180|316848|415692|395712|402921|383287|396082|423975|436187|501462|532467|536726|565559|525011|
Procedures|14173|96388|132083|199844|229186|229277|228228|281979|275292|311857|301313|234980|234368|221715|248148|251020|266978|275254|301612|322527|339447|358894|343313|364800|467920|469591|500436|565885|514454|551312|589518|929721|727040|737542|699508|705318|748438|795373|914014|969948|971222|1023602|955340|